Transmission device, transmission method, reception device, reception method, integrated circuit, and program

ABSTRACT

A transmission device that performs multiple-input multiple-output (MIMO) transmission of transmit data using a plurality of fundamental bands. The transmission device includes an error correction coding unit, a mapping unit, and a MIMO coding unit. The error correction coding unit, for each data block of predefined length, performs error correction coding and thereby generates an error correction coded frame. The mapping unit maps each predefined number of bits in the error correction coded frame to a corresponding symbol and thereby generates an error correction coded block. The MIMO coding unit performs MIMO coding with respect to the error correction coded block. Components of data included in the error correction coded block are allocated to at least two of the fundamental bands and transmitted.

TECHNICAL FIELD

The present invention relates to multiple-input multiple-output (MIMO)technology.

BACKGROUND ART

MIMO is conventional technology. MIMO is useful for large-capacitytransmission. MIMO is characterized by parallel transmission/receptionof multiple signals, by using multiple antennas to transmit and toreceive. For example, MIMO has been adopted in the Digital VideoBroadcasting Next Generation broadcasting system to Handheld (DVB-NGH)standard, which is a European transmission standard for handheldreceiving apparatus (Non-Patent Literature 3).

CITATION LIST Patent Literature

[Patent Literature 1]

Japanese Translation of PCT International Application Publication No.2008/526081 (WO 2006/068344)

Non-Patent Literature

[Non-Patent Literature 1]

“Frame structure channel coding and modulation for a second generationdigital terrestrial television broadcasting system (DVB-T2),” ETSI EN302 755 V1.3.1, April 2012

[Non-Patent Literature 2]

“Implementation guidelines for a second generation digital terrestrialtelevision broadcasting system (DVB-T2),” ETSI TS 102 831 V1.2.1, August2012

[Non-Patent Literature 3]

“Next Generation broadcasting system to Handheld, physical layerspecification (DVB-NGH) (Draft ETSI EN 303 105 V1.1.1),” DVB-TM documentTM4701r3, September 2012

[Non-Patent Literature 4]

“Transmission system for digital terrestrial television broadcasting,”ARIB standard ARIB STD-B31 Version 2.1, December 2012

[Non-Patent Literature 5]

“BER performance evaluation in 2×2 MIMO spatial multiplexing systemsunder Rician fading channels,” IEICE Trans. Fundamentals, vol. E91-A,no. 10, pp. 2798-2807, October 2008

SUMMARY OF INVENTION Technical Problem

Improvement in reception quality for MIMO is generally being sought. Thepresent invention aims to provide a transmission device that improvesreception quality for MIMO.

Solution to Problem

In order to achieve the above-described aims, a transmission devicepertaining to an aspect of the present invention is a transmitter thatperforms multiple-input multiple-output (MIMO) transmission of transmitdata using a plurality of fundamental bands, comprising: an errorcorrection coding unit that, for each data block of predefined length,performs error correction coding and thereby generates an errorcorrection coded frame; a mapping unit that maps each predefined numberof bits in the error correction coded frame to a corresponding symboland thereby generates an error correction coded block; and a MIMO codingunit that performs MIMO coding with respect to the error correctioncoded block, wherein components of data included in the error correctioncoded block are allocated to at least two of the fundamental bands andtransmitted.

Advantageous Effects of Invention

According to the above-described transmission device, reception qualityfor MIMO is improved.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 illustrates a configuration of a transmitter 100 in embodiment 1.

FIG. 2 illustrates a configuration of a MIMO physical layer pipe(MIMO-PLP) processing unit 131 in embodiment 1.

FIG. 3 illustrates a configuration of an L1 information processing unit141 in embodiment 1.

FIG. 4 illustrates a configuration of a receiver 200 in embodiment 1.

FIG. 5 illustrates a configuration of a MIMO-PLP processing unit 132 inembodiment 1.

FIG. 6 illustrates a configuration of an L1 information processing unit142 in embodiment 1.

FIG. 7 illustrates a configuration of a receiver 250 in embodiment 1.

FIG. 8 illustrates a configuration of a transmitter 300 in embodiment 2.

FIG. 9 illustrates a configuration of a MIMO-PLP processing unit 331 inembodiment 2.

FIG. 10 illustrates a configuration of a MIMO-PLP processing unit 332 inembodiment 2.

FIG. 11 illustrates a configuration of an L1 information processing unit341 in embodiment 2.

FIG. 12 illustrates a configuration of an L1 information processing unit342 in embodiment 2.

FIG. 13 illustrates a configuration of a receiver 400 in embodiment 2.

FIG. 14 illustrates a configuration of a MIMO-PLP processing unit 333 inembodiment 2.

FIG. 15 illustrates a configuration of a MIMO-PLP processing unit 334 inembodiment 2.

FIG. 16 illustrates a configuration of an L1 information processing unit343 in embodiment 2.

FIG. 17 illustrates a configuration of an L1 information processing unit344 in embodiment 2.

FIG. 18 illustrates a configuration of a receiver 450 in embodiment 2.

FIG. 19 illustrates a configuration of a transmitter 500 in embodiment3.

FIG. 20 illustrates a configuration of a MIMO-PLP processing unit 531 inembodiment 3.

FIG. 21 illustrates a configuration of a frequency channel interchangeunit 591 in embodiment 3.

FIG. 22 illustrates a configuration of an L1 information processing unit541 in embodiment 3.

FIG. 23 illustrates a configuration of a receiver 600 in embodiment 3.

FIG. 24 illustrates a configuration of a MIMO-PLP processing unit 532 inembodiment 3.

FIG. 25 illustrates a configuration of an L1 information processing unit542 in embodiment 3.

FIG. 26 illustrates a configuration of a receiver 650 in embodiment 3.

FIG. 27 illustrates a configuration of a transmitter 700 in embodiment4.

FIG. 28 illustrates a configuration of a MIMO-PLP processing unit 731 inembodiment 4.

FIG. 29 illustrates a configuration of a receiver 800 in embodiment 4.

FIG. 30 illustrates a configuration of a MIMO-PLP processing unit 732 inembodiment 4.

FIG. 31 illustrates a configuration of a receiver 850 in embodiment 4.

FIG. 32 illustrates a configuration of a transmitter 900 in embodiment5.

FIG. 33 illustrates a configuration of a MIMO-PLP processing unit 931 inembodiment 5.

FIG. 34 illustrates a configuration of a frequency channel interchangeunit 991 in embodiment 5.

FIG. 35 illustrates a configuration of an L1 information processing unit941 in embodiment 5.

FIG. 36 illustrates a configuration of a receiver 1000 in embodiment 5.

FIG. 37 illustrates a configuration of a MIMO-PLP processing unit 932 inembodiment 5.

FIG. 38 illustrates a configuration of an L1 information processing unit942 in embodiment 5.

FIG. 39 illustrates a configuration of a receiver 1050 in embodiment 5.

FIG. 40 illustrates a configuration of a transmitter 1100 in embodiment6.

FIG. 41 illustrates a configuration of a MIMO-PLP processing unit 1131in embodiment 6.

FIG. 42 illustrates a configuration of a frequency channel interchangeunit 1191 in embodiment 6.

FIG. 43 illustrates a configuration of an L1 information processing unit1141 in embodiment 6.

FIG. 44 illustrates a configuration of a MIMO-PLP processing unit 1132in embodiment 6.

FIG. 45 illustrates a configuration of an L1 information processing unit1142 in embodiment 6.

FIG. 46 illustrates a configuration of a transmitter 1300 in embodiment7.

FIG. 47 illustrates a configuration of a transport stream (TS)generation unit 1210 in embodiment 7.

FIG. 48 illustrates a configuration of an L1 information processing unit1341 in embodiment 7.

FIG. 49 illustrates a configuration of a receiver 1400 in embodiment 7.

FIG. 50 illustrates a configuration of a receiver 1450 in embodiment 7.

FIG. 51 illustrates a configuration of a transmitter 150 in embodiment8.

FIG. 52 illustrates a configuration of a receiver 270 in embodiment 8.

FIG. 53 illustrates a configuration of transmission frames of a DVB-NGHscheme.

FIG. 54 illustrates a configuration of a transmitter 2000 in a MIMOprofile of a conventional DVB-NGH scheme.

FIG. 55 illustrates a configuration of a MIMO-PLP processing unit 2031in the conventional DVB-NGH scheme.

FIG. 56 illustrates a configuration of an L1 information processing unit2041 in the conventional DVB-NGH scheme.

FIG. 57 illustrates a configuration of a transmitter 3000 in embodiment9.

FIG. 58 illustrates a configuration of a hierarchical layer processingunit 3041 in embodiment 9.

FIG. 59 illustrates a configuration of a segment of MIMO andmultiple-input single-output (MISO) transmission in embodiment 9.

FIG. 60 illustrates a portion of definitions of a transmission andmultiplexing configuration control (TMCC) signal in embodiment 9.

FIG. 61 illustrates a configuration of an existing Integrated ServicesDigital Broadcasting for Terrestrial Television Broadcasting (ISDB-T)receiver 3300 in embodiment 9.

FIG. 62 illustrates a configuration of a multiple hierarchical layer TSreproduction unit 3331 in embodiment 9.

FIG. 63 illustrates a configuration of a forward error coding (FEC)decoding unit 3333 in embodiment 9.

FIG. 64 illustrates a configuration of a receiver 3500 in embodiment 9.

FIG. 65 illustrates a configuration of a multiple hierarchical layer TSreproduction unit 3531 in embodiment 9.

FIG. 66 illustrates a configuration of a transmitter 3600 in embodiment10.

FIG. 67 illustrates a configuration of a low-density parity-check code(LDPC) hierarchical layer processing unit 3645 in embodiment 10.

FIG. 68 illustrates definitions of a TMCC signal related to LDPC codingin embodiment 10.

FIG. 69 illustrates a configuration of a receiver 3800 in embodiment 10.

FIG. 70 illustrates a configuration of a multiple hierarchical layer TSreproduction unit 3831 in embodiment 10.

FIG. 71 illustrates a configuration of an FEC decoding unit 3833 inembodiment 10.

FIG. 72 illustrates a configuration of a transmitter 4000 in embodiment11.

FIG. 73 illustrates a configuration of a TS generation unit 4210 inembodiment 11.

FIG. 74 illustrates a configuration of a transmitter 4300 in embodiment12.

FIG. 75 illustrates a configuration of a transmitter 5000 in an ISDB-Tscheme.

FIG. 76 illustrates a configuration of a hierarchical layer processingunit 5041 in the ISDB-T scheme.

FIG. 77 illustrates a configuration of a frequency interleaving unit5071 in the ISDB-T scheme.

FIG. 78 illustrates a configuration of a segment in the ISDB-T scheme.

DESCRIPTION OF EMBODIMENTS

<<Embodiments and Consideration by Inventors (Part 1)>>

The Digital Video Broadcasting-Terrestrial (DVB-T) scheme, which is atransmission standard of digital terrestrial television broadcastingfrom Europe, is pushing forward the conversion from conventionaltelevision broadcasting to digital broadcasting not only in Europe, butalso in many other countries. Also, with an aim of improving frequencyusage efficiency, standardization of the DVB-Second GenerationTerrestrial (DVB-T2) scheme began in 2006, and HDTV service using DVB-T2broadcasting was started in the UK in 2009. Like DVB-T, DVB-T2 uses anorthogonal frequency division multiplexing (OFDM) scheme (Non-PatentLiterature 1 and 2).

Also, standardization of the DVB-Next Generation broadcasting system toHandheld (DVB-NGH) scheme began in 2010, and a draft standard thereofwas approved by the DVB-Technical Module (DVB-TM) group in September2012 (Non-Patent Literature 3). DVB-NGH is the first digital televisionbroadcasting standard to have adopted multiple-input multiple-output(MIMO).

FIG. 53 illustrates a configuration of frames of the DVB-NGH scheme. TheDVB-NGH scheme uses a concept called physical layer pipes (PLPs). Onefeature of PLPs is that each PLP can have independently configuredtransmission parameters such as a modulation scheme and a coding rate.The number of PLPs is at least 1 and at most 255, and as an example,FIG. 53 illustrates a case in which there are 10 PLPs.

The following illustrates configurations of transmission frames.

Super frame=N_EBF elementary blocks of frames (N_EBF=2 to 255)

Elementary block of frames=N_F frame(s) (N_F=1 to 255)

Frame=P1 symbol+aP1 symbol+P2 symbol+data symbols

P1 symbol=1 symbol

aP1 symbol=0 to 1 symbol(s)

P2 symbol=N P2 symbol(s) (N P2 is unique, depending on fast Fouriertransform (FFT) size)

Data symbols=L_data symbols (L_data is variable, and has a lower limitand an upper limit)

The P1 symbol is transmitted at an FFT size of 1 k and a guard interval(GI) of ½. The P1 symbol conveys, by 3 bits of S1, a format of the framethat starts from the P1 symbol (NGH_SISO, NGH_MISO, ESC (which indicatesa format other than NGH_SISO or NGH_MISO), etc.).

Further, when the format of the frame is NGH_SISO or NGH_MISO, the P1symbol conveys, by four bits of S2, information about FFT sizes, etc.,of the one or more P2 symbol(s) and the data symbols following the P1symbol. Further, when the format of the frame is ESC, which indicates aformat other than NGH_SISO or NGH_MISO, the P1 symbol conveys, by fourbits of S2, the format indicated by ESC (NGH_MIMO, etc.).

The aP1 symbol is only transmitted when ESC is conveyed by S1 in the P1symbol. The aP1 symbol is transmitted at an FFT size of 1 k and a GI of½, the same as the P1 symbol, but the generation method of the GI of theaP1 symbol is different from that of the GI of the P1 symbol. The aP1symbol conveys, by 3 bits of S3, information about FFT sizes, etc., ofthe one or more P2 symbols and the data symbols following the aP1symbol.

The first part of the one or more P2 symbols includes L1 signallinginformation, and the remaining part includes main signal data. The datasymbols include continuation of the main signal data.

The L1 signalling information transmitted by the one or more P2 symbolsis composed of L1-pre information that transmits primarily informationcommon to all PLPs, and L1-post information that transmits primarilyinformation to each PLP. In FIG. 53, a configuration of logical channel(LC) type A is illustrated, which transmits the L1-post informationfollowing the L1-pre information. Note that in LC type B, the L1-postinformation is not necessarily next in transmission order after L1-preinformation.

FIG. 54 illustrates a configuration of a transmitter 2000 in a MIMOprofile of the DVB-NGH scheme (see Non-Patent Literature 3). Thetransmitter 2000 is an example in which two streams are inputted, i.e. acase in which two PLPs are generated, and the transmitter 2000 has aMIMO-PLP processing unit 2031 for each PLP. The transmitter 2000 furtherincludes a layer-1 (L1) information processing unit 2041 and a framebuilding unit 2051. Furthermore, the transmitter 2000 has, for eachtransmit antenna, an OFDM signal generation unit 2061, a digital/analog(D/A) conversion unit 2091, and a frequency conversion unit 2096.

The following describes operations of the transmitter 2000. EachMIMO-PLP processing unit 2031 corresponds to a PLP, allocates an inputstream to the PLP, performs processing related to the PLP, and outputsmapping data (cells) of the PLP for each of two transmit antennas (Tx-1,Tx-2). As an example of an input stream, the input stream may be atransport stream (TS), an audio/video service/component included in aprogram in a TS, a service/subcomponent of a base layer, enhancementlayer, etc., of a video using scalable video coding (SVC), etc. As anexample of information source coding, the information source coding maybe H.264, HEVC (H.265), etc.

The L1 information processing unit 2041 performs processing related toL1 information, and outputs mapping data of the L1 information for eachof the two transmit antennas (Tx-1, Tx-2). The frame building unit 2051generates and outputs transmission frames of the DVB-NGH scheme, asillustrated in FIG. 53, by using (i) the mapping data of thecorresponding PLP for each of the two transmit antennas (Tx-1, Tx-2),which is outputted from one of the MIMO-PLP processing units 2031, and(ii) the mapping data of the L1 information for the two transmitantennas (Tx-1, Tx-2), which is outputted from the L1 informationprocessing unit 2041.

Each of the OFDM signal generation units 2061, which each correspond toone of the transmit antennas, performs operations with respect to atransmission frame of the DVB-NGH scheme outputted from the framebuilding unit 2051, and outputs a digital baseband transmission signalof the DVB-NGH scheme. The operations include adding a pilot signal,performing an inverse fast Fourier transform (IFFT), inserting a GI, andinserting a P1 symbol and an aP1 symbol. Each of the D/A conversionunits 2091, which each correspond to one of the transmit antennas,performs D/A conversion of a digital baseband transmission signal of theDVB-NGH scheme outputted from a corresponding one of the OFDM signalgeneration units 2061, and outputs an analog baseband transmissionsignal of the DVB-NGH scheme. Each of the frequency conversion units2096, which each correspond to one of the transmit antennas, performsfrequency conversion to a frequency channel A with respect to an analogbaseband transmission signal of the DVB-NGH scheme outputted from acorresponding one of the D/A conversion units 2091, and outputs ananalog radio frequency (RF) transmission signal of the DVB-NGH schemefrom a corresponding one of the transmit antennas (not illustrated).

Next, details of the operations of the MIMO-PLP processing unit 2031 aredescribed. As illustrated in FIG. 55, the MIMO-PLP processing unit 2031includes an input processing unit 2071, a forward error correction (FEC)coding unit 2072, a mapping unit 2073, a MIMO coding unit 2076, and, foreach of the two transmit antennas, an interleaving unit 2074.

In the MIMO-PLP processing unit 2031, the input processing unit 2071converts an input stream to baseband frames. The FEC coding unit 2072performs Bose-Chaudhuri-Hocquenghem (BCH) coding and low-densityparity-check code (LDPC) coding with respect to each baseband frame,thereby adding a parity bit to each baseband frame and generating an FECframe from each baseband frame. The mapping unit 2073 performs mappingto I/Q coordinates to convert each FEC frame to an FEC block, andoutputs mapping data (cells). The MIMO coding unit 2076 performs MIMOcoding. Each of the interleaving units 2074, which each correspond toone of the two transmit antennas, performs interleaving of the mappingdata (cells) of an integer number of FEC blocks included in a timeinterleaving (TI) block.

Next, details of the operations of the L1 information processing unit2041 are described. As illustrated in FIG. 56, the L1 informationprocessing unit 2041 includes an L1 information generation unit 2081, anFEC coding unit 2082, a mapping unit 2083, and a MIMO coding unit 2076.

In the L1 information processing unit 2041, the L1 informationgeneration unit 2081 generates a transmission parameter and converts thetransmission parameter into L1-pre information and L1-post information.The FEC coding unit 2082 performs BCH coding and LDPC coding withrespect to each of the L1-pre information and the L1-post information,thereby adding a parity bit to each of the L1-pre information and theL1-post information. The mapping unit 2083 performs mapping to I/Qcoordinates and outputs mapping data (cells). The MIMO coding unit 2076performs MIMO coding.

Note that UHDTV (ultra HDTV) service, which surpasses the resolution ofHDTV service, is widely being considered. In particular, in order toimplement an 8 k image quality (7,680 horizontal×4,320 verticalresolution) service, even if HEVC (H.265) is used, transmission at apayload bit rate in excess of 100 Mbit/s is required. In actualbroadcasting using the DVB-T2 scheme in the UK, transmission isperformed at a payload bit rate of about 40 Mbit/s, by using a bandwidthof 8 MHz. Even if MIMO using two transmit antennas is applied to theDVB-T2 scheme, the payload bit rate would be at most about 80 Mbit/s,and transmission of an 8 k image quality service would not be possible.Accordingly, consideration of MIMO using a plurality of fundamentalbands (for example, 8 MHz) is important. Here, a “fundamental band”indicates a frequency channel as described above, and in FIG. 54 thefundamental band corresponds to channel A (CH-A). In other words,“fundamental band” indicates a bandwidth for a modulated RF transmissionsignal.

Here, in the Long Term Evolution Advanced (LTE-Advanced) standard (LTERel. 10), MIMO using a plurality of fundamental bands is specified.However, modulation and transmission channel coding is performedindependently for each fundamental band (“component carrier”, (CC)) intransport block units, and mapping is performed only with respect toeach individual CC. Accordingly, a frequency diversity effect achievedby transmission channel coding is limited to within each fundamentalband.

In Patent Literature 1, with respect to MIMO using a plurality offundamental bands, a configuration is disclosed such that, prior to MIMOcoding, interleaving is performed with respect to all of the pluralityof fundamental bands, but no disclosure is made of specific processinginvolved in the interleaving.

As stated above, with regard to MIMO using a plurality of fundamentalbands, a technical problem exists that a frequency diversity effect withrespect to a plurality of fundamental bands is insufficient.

Embodiments 1-8 of the present invention, described below, aim to solvethis technical problem, and aim to provide a transmitter, transmissionmethod, receiver, reception method, integrated circuit, and program,each of which exhibits a frequency diversity effect with respect to aplurality of fundamental bands.

The following is a detailed description of each embodiment, withreference to the drawings.

Embodiment 1

<Transmitter and Transmission Method>

FIG. 1 illustrates a configuration of a transmitter 100 in embodiment 1.Components that are the same as in the conventional transmitter have thesame reference signs, and description thereof is omitted here.

In the transmitter 100 illustrated in FIG. 1, when compared with thetransmitter 2000, which is conventional and illustrated in FIG. 54, theMIMO-PLP processing units 2031-1 and 2031-2, the L1 informationprocessing unit 2041, and the frame building unit 2051 are each replacedby a corresponding one of MIMO-PLP processing units 131-1 and 131-2, anL1 information processing unit 141, and a frame building unit 151.Further, in the transmitter 100, the OFDM signal generation units 2061and the D/A conversion units 2091 are provided on a one-for-one basisfor each combination of frequency channel and transmit antenna.Furthermore, in the transmitter 100, on a one-for-one basis for eachtransmit antenna, the frequency conversion units 2096 are providedcorresponding to the frequency channel A and frequency conversion units196 are provided corresponding to a frequency channel B.

The following describes operations of the transmitter 100. Each MIMO-PLPprocessing unit 131 corresponds to a PLP of an input stream, performsprocessing related to the PLP, and outputs mapping data (cells) of thePLP for each of two frequency channels (CH-A, CH-B) of each of twotransmit antennas (Tx-1, Tx-2).

The L1 information processing unit 141 performs processing related to L1information, and outputs mapping data of the L1 information for each ofthe two frequency channels (CH-A, CH-B) of each of the two transmitantennas (Tx-1, Tx-2).

The frame building unit 151 generates and outputs transmission frames,as illustrated in FIG. 53, by using (i) the mapping data of thecorresponding PLP for each of the two frequency channels (CH-A, CH-B) ofeach of the two transmit antennas (Tx-1, Tx-2), which is outputted fromeach of the MIMO-PLP processing units 131, and (ii) the mapping data ofthe L1 information for each of the two frequency channels (CH-A, CH-B)of each of the two transmit antennas (Tx-1, Tx-2), which is outputtedfrom the L1 information processing unit 141. Here, a point of differencebetween the transmitter 100 and the transmitter 2000, which isconventional and illustrated in FIG. 54, is that transmission frames aregenerated for each of the two frequency channels (CH-A, CH-B) of each ofthe two transmit antennas (Tx-1, Tx-2).

Each of the OFDM signal generation units 2061, which correspond to oneof the frequency channels of one of the two transmit antennas, and eachof the D/A conversion units 2091, which correspond to one of thefrequency channels of one of the two transmit antennas, perform the sameoperations as in the transmitter 2000, which is conventional andillustrated in FIG. 54.

Each of the frequency conversion units 2096, which each corresponds tothe frequency channel A of one of the two transmit antennas, performsfrequency conversion to a frequency channel A and outputs an analog RFtransmission signal from a corresponding one of the transmit antennas(not illustrated), the same as in the transmitter 2000, which isconventional and illustrated in FIG. 54. On the other hand, each of thefrequency conversion units 196, which each corresponds to the frequencychannel B of one of the two transmit antennas, performs frequencyconversion to a frequency channel B and outputs an analog RFtransmission signal from a corresponding one of the transmit antennas(not illustrated).

FIG. 2 illustrates a configuration of a MIMO-PLP processing unit 131.Compared to the MIMO-PLP processing unit 2031, which is conventional andillustrated in FIG. 55, the MIMO-PLP processing unit 131 is configuredsuch that the MIMO coding unit 2076 is replaced by a MIMO coding unit176. Further, in the MIMO-PLP processing unit 131, the interleavingunits 2074 are provided on a one-for-one basis for each combination offrequency channel and transmit antenna.

In the MIMO-PLP processing unit 131 illustrated in FIG. 2, the MIMOcoding unit 176 performs pre-coding using mapping data (cells) four byfour from the start of each FEC block, and outputs MIMO coded data forthe two frequency channels (CH-A, CH-B) of each of the two transmitantennas (Tx-1, Tx-2). When the mapping data (cells) of each FEC blockis expressed from the start as s1, s2, . . . , sNcells (Ncells=thenumber of cells in an FEC block), with respect to an input vector s=(s4k+1, s4 k+2, s4 k+3, s4 k+4)^(T) (k=0, 1, . . . , (Ncells/4)−1), anoutput vector z=(z1A_k, z2A_k, z1B_k, z2B_k)^(T) is expressed as inFormula 1.[Math 1]z=Fs  (Formula 1)

Note that zPQ_k is outputted data (MIMO coded data) with respect tofrequency channel Q, and transmit antenna P. F is a fixed pre-codingmatrix expressed by Formula 2.

$\begin{matrix}\lbrack {{Math}\mspace{14mu} 2} \rbrack & \; \\{F = \begin{pmatrix}{w11} & {w12} & {w13} & {w14} \\{w21} & {w22} & {w23} & {w24} \\{w31} & {w32} & {w33} & {w34} \\{w41} & {w42} & {w43} & {w44}\end{pmatrix}} & ( {{Formula}\mspace{14mu} 2} )\end{matrix}$

In Formula 2, each component wMN (M=1, 2, 3, 4, N=1, 2, 3, 4) of thefixed pre-coding matrix is a complex number. However, wMN need not allbe complex numbers, and real number components may be included.

As shown in Formula 3 and Formula 4, pre-coding may be performed byfurther multiplying by a phase change matrix X(k) that regularly changesFormula 1.

$\begin{matrix}\lbrack {{Math}\mspace{14mu} 3} \rbrack & \; \\{z = {{X(k)}{Fs}}} & ( {{Formula}\mspace{14mu} 3} ) \\\lbrack {{Math}\mspace{14mu} 4} \rbrack & \; \\{{X(k)} = \begin{pmatrix}1 & 0 & 0 & 0 \\0 & e^{j\frac{2\pi}{9}k} & 0 & 0 \\0 & 0 & 1 & 0 \\0 & 0 & 0 & e^{j\frac{2\pi}{9}k}\end{pmatrix}} & ( {{Formula}\mspace{14mu} 4} )\end{matrix}$

According to this phase change matrix X(k), with respect to a series ofMIMO coded data for a transmit antenna 2 (Tx-2), a phase change ofperiod 9 is performed that changes with respect to each of the twofrequency channels (CH-A, CH-B) by 2π/9 radian steps. Accordingly, bycausing a regular change in a MIMO channel, an effect is obtained bywhich reception quality of data is improved for a receiver in a line ofsight (LOS) environment in which direct waves are dominant. Note thatthis phase change is only one example, and the phase change is notlimited to a period of 9. When the number of this period becomesgreater, the reception performance of the receiver (more precisely, theerror correction performance) may increase proportionately (although alarger period is not always better, the possibility is high that a smallvalue such as 2 is better avoided).

Further, although the phase change shown in Formula 3 and Formula 4indicates rotation of the phase that is sequential and predefined (inthe above formulas, 2π/9 radian steps), rotation is not limited to thesame phase amount and the phase may be changed by a random amount. Theimportance of regularly changing the phase is that the phase of amodulated signal is changed regularly. A degree by which the phase ischanged is preferably uniform, for example, with respect to −π radiansto π radians, uniform distribution is preferable. However, randomdistribution is also possible.

According to the above-described operations performed by the MIMO codingunit 176, each component of the output vector z is expressed as inFormulas 5-8.[Math 5]z1A_k=f1A(s4k+1,s4k+2,s4k+3,s4k+4)  (Formula 5)[Math 6]z2A_k=f2A(s4k+1,s4k+2,s4k+3,s4k+4)  (Formula 6)[Math 7]z1B_k=f1B(s4k+1,s4k+2,s4k+3,s4k+4)  (Formula 7)[Math 8]z2B_k=f2B(s4k+1,s4k+2,s4k+3,s4k+4)  (Formula 8)

Here, f1A, f2A, f1B, and f2B express functions.

The interleaving units 2074 for each frequency channel of each of thetwo transmit antennas perform the same operations as the transmitter2000, which is conventional and illustrated in FIG. 54. Accordingly,each component of the mapping data (cells) in an FEC block istransmitted via all of the two channels (CH-A, CH-B) from each of thetwo transmit antennas (Tx-1, Tx-2).

FIG. 3 illustrates a configuration of an L1 information processing unit141. Compared to the L1 information processing unit 2041 that isconventional and illustrated in FIG. 56, the L1 information processingunit 141 is configured such that the L1 information generation unit 2081and the MIMO coding unit 2076 are replaced by an L1 informationgeneration unit 181 and the MIMO coding unit 176, respectively.

In the L1 information processing unit 141 illustrated in FIG. 3, the L1information generation unit 181 generates transmissions parametersrelated to the two frequency channels (CH-A, CH-B). The MIMO coding unit176 performs the same operations as the MIMO coding unit 176 illustratedin FIG. 2, mentioned above. Accordingly, each component of the mappingdata (cells) in an FEC block of L1 information is transmitted via all ofthe two frequency channels (CH-A, CH-B) from each of the two transmitantennas (Tx-1, Tx-2).

According to the above configuration, with regard to MIMO using aplurality of fundamental bands, a transmitter, transmission method, andprogram are provided that sufficiently exhibit a frequency diversityeffect with respect to the plurality of fundamental bands, bytransmitting each component of the mapping data (cells) in an FEC blockvia all of the frequency channels from each of all of the transmitantennas. In particular, outputting MIMO pre-coding processing resultsacross a plurality of fundamental bands is a feature of the transmitter100.

Note that the fundamental bands here indicate the frequency channelsdescribed above, and correspond to CH-A and CH-B in FIG. 1. In otherwords, “fundamental band” indicates a bandwidth of the modulated RFtransmission signal. Hereafter, the same definition is used for“fundamental band”.

Further, transmission using a plurality of fundamental bands meansgeneration of an RF transmission signal that includes content of acommon service and transmission thereof in each of the plurality offundamental bands at the same time. Here, the plurality of fundamentalbands may be adjacent to one another, or may include therebetweenfrequency channels or frequency bands used by another service, and notbe adjacent to each other.

Note that in a transmission using the plurality of fundamental bands,the RF transmission signal of the plurality of fundamental bands neednot always be transmitted at the same time. For example, a scheme isapplicable where the number of fundamental bands used can be switched,such that in a certain part of a time-divided period, transmission isperformed using only one fundamental band.

<Receiver and Reception Method>

FIG. 4 illustrates a configuration of a receiver 200 in embodiment 1.The receiver 200 illustrated in FIG. 4 corresponds to the transmitter100 illustrated in FIG. 1, and reflects functions of the transmitter100.

The receiver 200 has, on a one-for-one basis for each receive antenna(Rx-1, Rx-2), a tuner unit 205A, an analogue/digital (A/D) conversionunit 208A, a demodulation unit 211A, a frequency de-interleaving/L1information de-interleaving unit 215A, a PLP de-interleaving unit 221A,and a selection unit 231A, all for one frequency channel (CH-A).Further, the receiver 200 has, on a one-for-one basis for each receiveantenna (Rx-1, Rx-2), a tuner unit 205B, an A/D conversion unit 208B, ademodulation unit 211B, a frequency de-interleaving/L1 informationde-interleaving unit 215B, a PLP de-interleaving unit 221B, and aselection unit 231B, all for the other frequency channel (CH-B). Thereceiver 200 further includes a MIMO de-mapping unit 232 and an FECdecoding unit 233.

The following describes operations of the receiver 200.

When an analog RF transmission signal is inputted via the one receiveantenna Rx-1, the tuner unit 205A-1 selectively receives a signal of onefrequency channel (CH-A), and down-converts the signal to a predefinedband. The A/D conversion unit 208A-1 performs analogue to digitalconversion, and outputs a digital reception signal. The demodulationunit 211A-1 performs OFDM demodulation, and outputs cell data of I/Qcoordinates and a transmission channel estimate value. The frequencyde-interleaving/L1 information de-interleaving unit 215A-1 performsfrequency de-interleaving on cell data and the transmission channelestimate value of a PLP including selected program data, and performsde-interleaving on cell data and the transmission channel estimate valueof L1 information. The cell data and transmission channel estimate valueof L1 information that is de-interleaved is selected by the selectionunit 231A-1.

When an analog RF transmission signal is inputted via the other receiveantenna Rx-2, the tuner unit 205A-2, the A/D conversion unit 208A-2, thedemodulation unit 211A-2, the frequency de-interleaving/L1 informationde-interleaving unit 215A-2, the PLP de-interleaving unit 221A-2, andthe selection unit 231A-2 perform operations in the same way asdescribed above in connection with Rx-1 (selective reception of CH-A).

Further, when an analog RF transmission signal is inputted via the onereceive antenna Rx-1, the tuner unit 205B-1 selectively receives thesignal of the other frequency channel (CH-B), and down-converts thesignal to a predefined band. The A/D conversion unit 208B-1, thedemodulation unit 211B-1, the frequency de-interleaving/L1 informationde-interleaving unit 215B-1, the PLP de-interleaving unit 221B-1, andthe selection unit 231-B perform operations in the same way as describedabove in connection with Rx-1 (selective reception of CH-A).

Further, when the analog RF transmission signal is inputted via theother receive antenna Rx-2, the tuner unit 205B-2, the A/D conversionunit 208B-2, the demodulation unit 211B-2, the frequencyde-interleaving/L1 information de-interleaving unit 215B-2, the PLPde-interleaving unit 221B-2, and the selection unit 231-B2 performoperations in the same way as described above in connection with Rx-1(selective reception of CH-A).

With respect to the cell data and a transmission channel estimate valueof the L1 information outputted from the four selection units (231A-1,231A-2, 231B-1, 231-B2), the MIMO de-mapping unit 232 performs MIMOde-mapping processing, and the FEC decoding unit 233 performs LDPCdecoding processing and BCH decoding processing. Thus, the L1information is decoded.

The four PLP de-interleaving units 221 (221A-1, 221A-2, 221B-1, and221B-2), based on scheduling information included in the L1 information,which is decoded, extract cell data and a transmission channel estimatevalue of a PLP (for example, the PLP-1 illustrated in FIG. 1) includinga program selected by a user, and perform de-interleaving that is theinverse of the interleaving processing of the transmission side.

The four selection units (231A-1, 231A-2, 231B-1, and 231B-2) eachselect an output of a corresponding one of the four PLP de-interleavingunits (221A-1, 221A-2, 221B-1, 221B-2).

With respect to the cell data and the transmission channel estimatevalue of the PLP outputted from the four selection units (231A-1,231A-2, 231B-1, and 231B-2), the MIMO de-mapping unit 232 performs aMIMO de-mapping process, and the FEC decoding unit 233 performs LDPCdecoding processing and BCH decoding processing. Thus, the PLP data isdecoded.

Further, the components of the receiver 200 illustrated in FIG. 4, asidefrom the tuner unit 205A and 205B, may be included in an integratedcircuit 240.

The following describes operations of the MIMO de-mapping unit 232. Withrespect to each FEC block inputted to the MIMO de-mapping unit 232, aninput vector y=(y1A_k, y2A_k, y1B_k, y2B_k)^(T) (k=0, 1, . . . ,(Ncells/4)−1) is expressed as shown in Formula 9.[Math 9]y=Hz+n  (Formula 9)

yPQ_k is input data with respect to a receive antenna P and a frequencychannel Q. H is a transmission channel matrix expressed in Formula 10.n=(n1A_k, n2A_k, n1B_k, n2B_k)^(T) is a noise vector. nPQ_k is anindependent and identically distributed (i.i.d.) complex Gaussian noiseof variance G² that has an average value 0.

$\begin{matrix}\lbrack {{Math}\mspace{14mu} 10} \rbrack & \; \\{H = \begin{pmatrix}{h11\_ k} & {h\; 12{\_ k}} & 0 & 0 \\{h\; 21{\_ k}} & {h\; 22{\_ k}} & 0 & 0 \\0 & 0 & {h\; 33{\_ k}} & {h\; 34{\_ k}} \\0 & 0 & {h\; 43{\_ k}} & {h\; 44{\_ k}}\end{pmatrix}} & ( {{Formula}\mspace{14mu} 10} )\end{matrix}$

Using Formula 9 and Formula 10, the MIMO de-mapping unit 232 performsmaximum-likelihood decoding (MLD), calculates a vector estimated values′=(s′4 k+1, s′4 k+2, s′4 k+3, s′4 k+4)^(T) (k=0, 1, . . . ,(Ncells/4)−1) of each FEC block, and outputs the vector estimated values′. Note that processing of the MIMO de-mapping unit 232 is not limitedto MLD, and other methods such as zero forcing (ZF) may be used.

Here, in Formula 10, each component hMN_k (M=1, 2, 3, 4, N=1, 2, 3, 4)of the transmission channel matrix H is a complex number. A point worthnoting is that components of the transmission channel matrix H withrespect to (M=1, 2, N=3, 4) and (M=3, 4, N=1, 2) are 0. Componentsmultiplying by 0 output 0, in order to differentiate between the twodifferent frequency channels (CH-A, CH-B). Accordingly, Formula 9 andFormula 10 include the transmission channel matrix H that has 4 rows and4 columns, but compared with a transmission channel matrix H in whichall components are non-zero, the amount of computation with regard tothe MIMO de-mapping unit 232 is less.

The FEC decoding unit 233 performs LDPC decoding and BCH decoding withrespect to the vector estimate value s′ of each FEC block outputted fromthe MIMO de-mapping unit 232, and outputs a decoding result.

According to the above configuration, with respect to MIMO using aplurality of fundamental bands, a receiver, reception method, andprogram are provided that receive each component of the mapping data(cells) in an FEC block transmitted from all of the frequency channelsof each of all of the transmit antennas.

<Modification of Transmitter and Transmission Method>

The MIMO-PLP processing unit 131 illustrated in FIG. 2 may be replacedby a MIMO-PLP processing unit 132 illustrated in FIG. 5. In the MIMO-PLPprocessing unit 132 illustrated in FIG. 5, when compared to the MIMO-PLPprocessing unit 131 illustrated in FIG. 2, the MIMO coding unit 176 isreplaced by a MIMO coding unit 177. Further, the two interleaving units2074-3 and 2074-4 corresponding to the frequency channel B (CH-B) arereplaced by interleaving units 174-3 and 174-4, respectively.

The MIMO coding unit 177 illustrated in FIG. 5 may perform pre-coding bymultiplying by the phase change matrix X(k) shown in Formula 11.

$\begin{matrix}\lbrack {{Math}\mspace{14mu} 11} \rbrack & \; \\{{X(k)} = \begin{pmatrix}1 & 0 & 0 & 0 \\0 & e^{j\frac{2\pi}{9}k} & 0 & 0 \\0 & 0 & 1 & 0 \\0 & 0 & 0 & e^{{j\frac{2\pi}{9}k} + \theta}\end{pmatrix}} & ( {{Formula}\mspace{14mu} 11} )\end{matrix}$

π/9 is given as an example of the value of 0 in Formula 11, but thevalue of θ is not limited in this way. According to the phase changematrix X(k) shown in Formula 11, with respect to a series of MIMO codeddata for the transmit antenna 2 (Tx-2), a phase change of period 9 isperformed that changes an initial value of 0 radians in 2π/9 radiansteps for one frequency channel (CH-A). For the other frequency channel(CH-B), a phase change of period 9 is performed that changes an initialvalue of π/9 radians in 2π/9 radian steps. When the two frequencychannels (CH-A, CH-B) are transmitted from the same transmit antennagroup (Tx-1, Tx-2) and received by the same receive antenna group (Rx-1,Rx-2), especially in an LOS environment in which direct waves dominate,the transmission channel characteristics of the two frequency channels(CH-A, CH-B) are likely to have a high correlation. The phase changematrix X(k) shown in Formula 11 makes it possible to obtain an effect ofincreasing reception quality of data by a receiver, by differentiatingthe phase change pattern of the two frequency channels (CH-A, CH-B) andthereby reducing correlation therebetween. Note that the method ofdifferentiating the phase change pattern is not limited to the abovemethod. For example, a different period of phase change may be used.

The two interleaving units 174-3 and 174-4 illustrated in FIG. 5 thatcorrespond to the frequency channel B (CH-B) may perform interleaving ofa different pattern to the two interleaving units 2074-1 and 2074-2illustrated in FIG. 5 that correspond to the frequency channel A (CH-A).The number of frames that are interleaved is given as an example of adifferent pattern, but different patterns are not limited to thisexample. A point worth noting here is that the two interleaving units2074-1 and 2074-2 that correspond to the frequency channel A (CH-A)perform interleaving of the same pattern, and the two interleaving units174-1 and 174-2 that correspond to the frequency channel B (CH-B)perform interleaving of the same pattern. Accordingly, the amount ofcomputation for MIMO demapping is not increased, while making itpossible to obtain an effect of increasing reception quality of data bya receiver, by reducing correlation between the two frequency channels(CH-A, CH-B) with respect to transmission channel characteristics.

As described above, with respect to the two frequency channels (CH-A,CH-B), one or more of: differentiation of phase change patterns of thephase change matrix X(k); and differentiation of interleaving patternsmay be used.

Further, the L1 information processing unit 141 illustrated in FIG. 3may be replaced by the L1 information processing unit 142 illustrated inFIG. 6. The L1 information processing unit 142 illustrated in FIG. 6,compared to the L1 information processing unit 141 illustrated in FIG.3, is configured such that the MIMO coding unit 176 is replaced by theMIMO coding unit 177. The MIMO coding unit 177 performs the sameoperations as the MIMO coding unit 177 illustrated in FIG. 5.Accordingly, the phase change matrix X(k) shown in Formula 11 makes itpossible to obtain an effect of increasing reception quality of data bya receiver, by differentiating the phase change pattern of the twofrequency channels (CH-A, CH-B) and thereby reducing correlationtherebetween.

<Modification of Receiver and Reception Method>

FIG. 7 illustrates a configuration of a receiver 250 corresponding to acase in which the MIMO-PLP processing unit 132 illustrated in FIG. 5 andthe L1 information processing unit 142 illustrated in FIG. 6 are used.The receiver 250 illustrated in FIG. 7, compared to the receiver 200illustrated in FIG. 4, is configured such that the PLP de-interleavingunits 221B for the frequency channel B (CH-B) are replaced by PLPde-interleaving units 222B, and the MIMO demapping unit 232 is replacedby a MIMO demapping unit 235. The PLP de-interleaving units 222B for thefrequency channel B (CH-B) perform de-interleaving that is the inverseof the interleaving performed by the interleaving unit 174 illustratedin FIG. 5. Further, the MIMO de-mapping unit 235 performs MLD by usingFormula 9 and Formula 10, taking into consideration the phase changematrix X(k) shown in Formula 11 instead of the phase change matrix X(k)shown in Formula 4.

Further, the components of the receiver 250, illustrated in FIG. 7,aside from the tuner unit 205A and 205B, may be included in anintegrated circuit 241.

Embodiment 2

<Transmitter and Transmission Method>

FIG. 8 illustrates a configuration of a transmitter 300 in embodiment 2.Components that are the same as in the conventional transmitter or thetransmitter in embodiment 1 have the same reference signs, anddescription thereof is omitted here.

The transmitter 300 illustrated in FIG. 8, compared to the transmitter100 in embodiment 1 and illustrated in FIG. 1, is configured such thatthe MIMO-PLP processing units 131 are replaced by MIMO-PLP processingunits 331 and the L1 information processing unit 141 is replaced by anL1 information processing unit 341.

FIG. 9 illustrates a configuration of the MIMO-PLP processing unit 331.Compared with the MIMO-PLP processing unit 131 in embodiment 1,illustrated in FIG. 2, the MIMO-PLP processing unit 331 is configuredsuch that a serial to parallel (S/P) conversion unit 378 is added.Further, the MIMO-PLP processing unit 331 is configured such that theMIMO coding unit 176 is replaced by two MIMO coding units 376A and 376B.

In the MIMO-PLP processing unit 331 illustrated in FIG. 9, the S/Pconversion unit 378 allocates mapping data (cells) two by two from thestart of each FEC block inputted thereto in turn to the MIMO coding unit376A, the MIMO coding unit 376B, the MIMO coding unit 376A, the MIMOcoding unit 376B, . . . . Accordingly, the mapping data (cells) of eachFEC block are allocated half and half to the MIMO coding units 376A and376B.

The MIMO coding unit 376A performs pre-coding using mapping data (cells)two by two from the start of the half portion of each FEC block inputtedthereto, and outputs MIMO coded data with respect to the two transmitantennas (Tx-1, Tx-2). When the mapping data (cells) of each FEC blockis expressed from the start as s1, s2, . . . , sNcells (Ncells=thenumber of cells in an FEC block), with respect to an input vector sA=(s4 k+1, s4 k+2)^(T) (k=0, 1, . . . , (Ncells/4)−1) inputted to theMIMO coding unit 376A, an output vector z_A=(z1A_k, z2A_k)^(T) isexpressed as in Formula 12.[Math 12]z_A=F_As_A  (Formula 12)

Note that zPQ_k is outputted data (MIMO coded data) with respect tofrequency channel Q and transmit antenna P. F_A is a fixed pre-codingmatrix expressed by Formula 13.

$\begin{matrix}\lbrack {{Math}\mspace{14mu} 13} \rbrack & \; \\{{F\_ A} = \begin{pmatrix}{w\; 11{\_ A}} & {w\; 12{\_ A}} \\{w\; 21{\_ A}} & {w\; 22{\_ A}}\end{pmatrix}} & ( {{Formula}\mspace{14mu} 13} )\end{matrix}$

In Formula 13, each component wMN_A (M=1, 2, N=1, 2) of the fixedpre-coding matrix is a complex number. However, wMN_A need not all becomplex numbers, and real number components may be included.

As shown in Formula 14 and Formula 15, pre-coding may be performed byfurther multiplying by a phase change matrix X_A(k) that regularlychanges Formula 12.

$\begin{matrix}\lbrack {{Math}\mspace{14mu} 14} \rbrack & \; \\{{z\_ A} = {{X\_ A}(k){F\_ As}{\_ A}}} & ( {{Formula}\mspace{14mu} 14} ) \\\lbrack {{Math}\mspace{14mu} 15} \rbrack & \; \\{{{X\_ A}(k)} = \begin{pmatrix}1 & 0 \\0 & e^{j\frac{2\pi}{9}k}\end{pmatrix}} & ( {{Formula}\mspace{14mu} 15} )\end{matrix}$

According to this phase change matrix X_A(k), with respect to a seriesof MIMO coded data for the transmit antenna 2 (Tx-2), a phase change ofperiod 9 is performed that changes in 2π/9 radian steps. Accordingly, bycausing a regular change in a MIMO channel, an effect is obtained bywhich reception quality of data is improved for a receiver in a line ofsight (LOS) environment in which direct waves are dominant. Note thatthis phase change is only one example, and the phase change is notlimited to a period of 9. When the number of this period becomesgreater, the reception performance of the receiver (more precisely, theerror correction performance) may increase proportionately (although alarger period is not always better, the possibility is high that a smallvalue such as 2 is better avoided).

Further, although the phase change shown in Formula 14 and Formula 15indicates rotation of the phase that is sequential and predefined (inthe above formulas, 2π/9 radian steps), rotation is not limited to thesame phase amount and the phase may be changed by a random amount. Theimportance of regularly changing the phase is that the phase of amodulated signal is changed regularly. A degree by which the phase ischanged is preferably uniform, for example, with respect to −π radiansto π radians, uniform distribution is preferable. However, randomdistribution is also possible.

The MIMO coding unit 376B outputs MIMO coded data with respect to thetwo transmit antennas (Tx-1, Tx-2), in the same way as the MIMO codingunit 376A. With respect to an input vector s B=(s4 k+3, s4 k+4)^(T)(k=0, 1, . . . , (Ncells/4)−1) inputted to the MIMO coding unit 376B, anoutput vector z_B=(z1B_k, z2B_k)^(T) is expressed as in Formula 16.[Math 16]z_B=F_Bs_B  (Formula 16)

F_B is the fixed pre-coding matrix expressed in Formula 17.[Math 17]F_B=F_A  (Formula 17)

As shown in Formula 18 and Formula 19, pre-coding may be performed byfurther multiplying by a phase change matrix X_B(k) that regularlychanges Formula 16.[Math 18]z_B=X_B(k)F_Bs_B  (Formula 18)[Math 19]X_B(k)=X_A(k)  (Formula 19)

According to the above-described operations performed by the MIMO codingunits 376A and 376B, each component of the output vector z_A and z_B isexpressed as in Formulas 20-23.[Math 20]z1A_k=f1(s4k+1,s4k+2)  (Formula 20)[Math 21]z2A_k=f2(s4k+1,s4k+2)  (Formula 21)[Math 22]z1B_k=f1(s4k+3,s4k+4)  (Formula 22)[Math 23]z2B_k=f2(s4k+3,s4k+4)  (Formula 23)

Here, f1 and f2 express functions.

The interleaving units 2074 for each frequency channel of each of thetwo transmit antennas performs operations in the same way as theinterleaving units 2074 illustrated in FIG. 55. In this way, of themapping data (cells) in an FEC block, half of the components thereof aretransmitted via one frequency channel (CH-A) from each of the twotransmit antennas (Tx-1, Tx-2). Further, the remaining half of thecomponents are transmitted via the other frequency channel (CH-B) fromeach of the two transmit antennas (Tx-1, Tx-2).

The MIMO-PLP processing unit 331 illustrated in FIG. 9 may be replacedby a MIMO-PLP processing unit 332 illustrated in FIG. 10. The MIMO-PLPprocessing unit 332 illustrated in FIG. 10, when compared to theMIMO-PLP processing unit 331 illustrated in FIG. 9, is configured suchthat the S/P conversion unit 378 subsequent to the mapping unit 2073 isreplaced by an S/P conversion unit 379 preceding the mapping units 2073.Further, two mapping units 2073 are provided.

With respect to each FEC frame outputted from the FEC coding unit 2072,the S/P conversion unit 379 illustrated in FIG. 10 allocates a bit groupcomposed of mapping data (cells) two by two from the start of the FECblock in turn to the mapping unit 2073A, the mapping unit 2073B, themapping unit 2073A, the mapping unit 2073B, . . . . The mapping unit2073A and the mapping unit 2073B perform operations in the same way asthe mapping unit 2073 illustrated in FIG. 9. Accordingly, the mappingdata (cells) of each FEC block are allocated half and half to the MIMOcoding units 376A and 376B, in the same way as the allocation in theMIMO-PLP processing unit 331 illustrated in FIG. 9. Other operations ofthe MIMO-PLP processing unit 332 are the same as that of the MIMO-PLPprocessing unit 331 illustrated in FIG. 9.

FIG. 11 illustrates a configuration of the L1 information processingunit 341. When compared to the L1 information processing unit 141 inembodiment 1, illustrated in FIG. 3, the L1 information processing unit341 is configured such that the S/P conversion unit 378 is added.Further, the L1 information processing unit 341 is configured such thatthe MIMO coding unit 176 is replaced by the two MIMO coding units 376Aand 376B.

In the L1 information processing unit 341 illustrated in FIG. 11, theS/P conversion unit 378, in the same way as the operation by the S/Pconversion unit 378 illustrated in FIG. 9, allocates mapping data(cells) two by two from the start of each FEC block inputted thereto inturn to the MIMO coding unit 376A, the MIMO coding unit 376B, the MIMOcoding unit 376A, the MIMO coding unit 376B, . . . . Accordingly, themapping data (cells) of each FEC block are allocated half and half tothe MIMO coding units 376A and 376B.

The MIMO coding unit 376A and the MIMO coding unit 376B, in the same wayas the operations of the MIMO coding units 376A and 376B illustrated inFIG. 9, perform pre-coding using the mapping data (cells) two by twofrom the start of each half portion of an FEC block inputted thereto,and output MIMO coded data with respect to the two transmit antennas(Tx-1, Tx-2). Accordingly, half of the components of the mapping data(cells) in an FEC block of L1 information are transmitted via onefrequency channel (CH-A) from each of the two transmit antennas (Tx-1,Tx-2). Further, the remaining half of the components are transmitted viathe other frequency channel (CH-B) from each of two transmit antennas(Tx-1, Tx-2).

Note that the L1 information processing unit 341 illustrated in FIG. 11may be replaced by an L1 information processing unit 342 illustrated inFIG. 12. The L1 information processing unit 342 illustrated in FIG. 12,when compared with the L1 information processing unit 341 illustrated inFIG. 11, is configured such that the S/P conversion unit 378 subsequentto the mapping unit 2083 is replaced by the S/P conversion unit 379preceding the mapping units 2083. Further, two mapping units 2083 areprovided.

The S/P conversion unit 379 illustrated in FIG. 12, in the same way asthe S/P conversion unit 379 illustrated in FIG. 10 and with respect toeach FEC frame outputted from the FEC coding unit 2082, allocates a bitgroup composed of mapping data (cells) two by two from the start of theFEC block in turn to the mapping unit 2083A, the mapping unit 2083B, themapping unit 2083A, the mapping unit 2083B, . . . . The mapping unit2083A and the mapping unit 2083B perform operations in the same way asthe mapping unit 2083 illustrated in FIG. 11. Accordingly, the mappingdata (cells) of an FEC block of L1 information are allocated half andhalf to the MIMO coding units 376A and 376B, in the same way as theallocation in the L1 information processing unit 341 illustrated in FIG.11. Other operations of the L1 information processing unit 342 are thesame as that of the L1 information processing unit 341 illustrated inFIG. 11.

According to the above configuration, with regard to MIMO using aplurality of fundamental bands, a transmitter, transmission method, andprogram are provided that sufficiently exhibit a frequency diversityeffect with respect to the plurality of fundamental bands, bytransmitting half of the components of mapping data (cells) of an FECblock via one frequency channel (CH-A) from the two transmit antennas(Tx-1, Tx-2), and the remaining half of the components via anotherfrequency channel (CH-B) from the two transmit antennas (Tx-1, Tx-2). Inparticular, mapping data (cells) being allocated two by two from thestart of each FEC block in turn to the MIMO coding unit 376A, the MIMOcoding unit 376B, the MIMO coding unit 376A, the MIMO coding unit 376B,. . . , is a feature of the transmitter 300.

<Receiver and Reception Method>

FIG. 13 illustrates a configuration of a receiver 400 in embodiment 2.The receiver 400 illustrated in FIG. 13 corresponds to the transmitter300 illustrated in FIG. 8, and reflects functions of the transmitter300. Components that are the same as in the conventional receiver or thereceiver in embodiment 1 have the same reference signs, and descriptionthereof is omitted here.

The receiver 400 illustrated in FIG. 13, compared to the receiver 200 inembodiment 1, illustrated in FIG. 4, is configured such that the MIMOde-mapping unit 232 is replaced by two MIMO de-mapping units 432.Further, a parallel to serial (P/S) conversion unit 435 is added.

The following describes operations of the transmitter 400 illustrated inFIG. 13. With respect to the mapping data (cells) of each half portionof an FEC block inputted to the MIMO de-mapping unit 432A, an inputvector y_A=(y1A_k, y2A_k)^(T) (k=0, 1, . . . , (Ncells/4)−1) isexpressed as shown in Formula 24.[Math 24]y_A=H_Az_A+n_A  (Formula 24)

yPQ_k is input data with respect to a receive antenna P and a frequencychannel Q. H_A is a transmission channel matrix expressed in Formula 25.n_A=(n1A_k, n2A_k)^(T) is a noise vector. nPQ_k is an i.i.d. complexGaussian noise of variance G² that has an average value 0.

$\begin{matrix}\lbrack {{Math}\mspace{14mu} 25} \rbrack & \; \\{{H\_ A} = \begin{pmatrix}{h11\_ k} & {h\; 12{\_ k}} \\{h\; 21{\_ k}} & {h\; 22{\_ k}}\end{pmatrix}} & ( {{Formula}\mspace{14mu} 25} )\end{matrix}$

Using Formula 24 and Formula 25, the MIMO de-mapping unit 432A performsMLD, calculates a vector estimated value s′=(s′4 k+1, s′4 k+2)^(T) (k=0,1, . . . , (Ncells/4)−1) of half of the FEC blocks, and outputs thevector estimated value s′. Note that processing of the MIMO de-mappingunit 432A is not limited to MLD, and other methods such as ZF may beused.

On the other hand, with respect to mapping data (cells) of a remaininghalf of the FEC blocks inputted to the MIMO de-mapping unit 432B, aninput vector y_B=(y1B_k, y2B_k)^(T) (k=0, 1, . . . , (Ncells/4)−1) isexpressed as in Formula 26.[Math 26]y_B=H_Bz_B+n_B  (Formula 26)

Note that H B is a transmission channel matrix expressed by Formula 27,and n B=(n1B_k, n2B_k)^(T) is a noise vector.

$\begin{matrix}\lbrack {{Math}\mspace{14mu} 27} \rbrack & \; \\{{H\_ B} = \begin{pmatrix}{h33\_ k} & {h\; 34{\_ k}} \\{h\; 43{\_ k}} & {h\; 44{\_ k}}\end{pmatrix}} & ( {{Formula}\mspace{14mu} 27} )\end{matrix}$

Using Formula 26 and Formula 27, the MIMO de-mapping unit 432B performsMLD, calculates a vector estimated value s′=(s′4 k+3, s′4 k+4)^(T) (k=0,1, . . . , (Ncells/4)−1) of a remaining half of the FEC blocks, andoutputs the vector estimated value s′. Note that processing of the MIMOde-mapping unit 432B is not limited to MLD, and other methods such aszero forcing (ZF) may be used.

The P/S conversion unit 435 multiplexes the vector estimated values′=(s′4 k+1, s′4 k+2)^(T) (k=0, 1, . . . , (Ncells/4)−1) of half of theFEC blocks, which is outputted from the MIMO de-mapping unit 432A, andthe vector estimated value s′=(s′4 k+3, s′4 k+4)^(T) of the remaininghalf of the FEC blocks, which is outputted from the MIMO de-mapping unit432B, and outputs a vector estimated value s′=(s′4 k+1, s′4 k+2, s′4k+3, s′4 k+4)^(T) of each FEC block.

Here, in Formula 25 and Formula 27, each component hMN_k (M=1, 2, N=1,2) (M=3, 4, N=3, 4) of the transmission channel matrices H_A and H B isa complex number. A point worth noting is that Formula 25 and Formula 27include a transmission channel matrix H, which has two rows by twocolumns, and not four rows by four columns. Accordingly, compared to theMIMO de-mapping unit 232 in embodiment 1, the amount of computation withrespect to the MIMO de-mapping units 432A and 432B is less.

According to the above configuration, with regard to MIMO using aplurality of fundamental bands, a receiver, reception method, andprogram are provided that receive a signal transmitted by transmittinghalf of the components of mapping data (cells) of an FEC block via onefrequency channel (CH-A) from the two transmit antennas (Tx-1, Tx-2),and the remaining half of the components via another frequency channel(CH-B) from the two transmit antennas (Tx-1, Tx-2).

Further, the components of the receiver 400 illustrated in FIG. 13,aside from the tuner units 205A and 205B, may be included in anintegrated circuit 440.

<Modification of Transmitter and Transmission Method>

The MIMO-PLP processing unit 331 illustrated in FIG. 9 may be replacedby a MIMO-PLP processing unit 333 illustrated in FIG. 14. In theMIMO-PLP processing unit 333 illustrated in FIG. 14, compared to theMIMO-PLP processing unit 331 illustrated in FIG. 9, the MIMO coding unit376B is replaced by a MIMO coding unit 377B. Further, the twointerleaving units 2074-3 and 2074-4 corresponding to the frequencychannel B (CH-B) are replaced by the interleaving units 174-3 and 174-4,respectively.

The MIMO coding unit 377B illustrated in FIG. 14 may perform pre-codingusing the fixed pre-coding matrix F_B shown in Formula 28.

$\begin{matrix}\lbrack {{Math}\mspace{14mu} 28} \rbrack & \; \\{{F\_ B} = \begin{pmatrix}{w\; 11{\_ B}} & {w\; 12{\_ B}} \\{w\; 21{\_ B}} & {w\; 22{\_ B}}\end{pmatrix}} & ( {{Formula}\mspace{14mu} 28} )\end{matrix}$

Accordingly, it is possible to obtain an effect of increasing receptionquality of data by a receiver, by reducing correlation between the twofrequency channels (CH-A, CH-B) with respect to transmission channelcharacteristics.

Further, the MIMO coding unit 377B illustrated in FIG. 14 may performpre-coding by multiplying by the phase change matrix X_B(k) shown inFormula 29.

$\begin{matrix}\lbrack {{Math}\mspace{14mu} 29} \rbrack & \; \\{{{X\_ B}(k)} = \begin{pmatrix}1 & 0 \\0 & e^{{j\frac{2\pi}{9}k} + \theta}\end{pmatrix}} & ( {{Formula}\mspace{14mu} 29} )\end{matrix}$

π/9 is given as an example of the value of 0 in Formula 29, but thevalue of θ is not limited in this way. According to the phase changematrix X_B(k) shown in Formula 29, with respect to a series of MIMOcoded data for the transmit antenna 2 (Tx-2), a phase change of period 9is performed that changes an initial value of 0 radians in 2π/9 radiansteps for one frequency channel (CH-A). For the other frequency channel(CH-B), a phase change of period 9 is performed that changes an initialvalue of π/9 radians in 2π/9 radian steps. When the two frequencychannels (CH-A, CH-B) are transmitted from the same transmit antennagroup (Tx-1, Tx-2) and received by the same receive antenna group (Rx-1,Rx-2), especially in an LOS environment in which direct waves dominate,the transmission channel characteristics of the two frequency channels(CH-A, CH-B) are likely to have a high correlation. The phase changematrices X_A(k) and X_B(k) shown in Formula 15 and Formula 29 make itpossible to obtain an effect of increasing reception quality of data bya receiver, by differentiating the phase change pattern of the twofrequency channels (CH-A, CH-B) and thereby reducing correlationtherebetween.

The two interleaving units 174-3 and 174-4 illustrated in FIG. 14 thatcorrespond to the frequency channel B (CH-B) may perform interleaving ofa different pattern to the two interleaving units 2074-1 and 2074-2 thatcorrespond to the frequency channel A (CH-A), in the same way as in the<Modification of Transmitter and Transmission Method> in embodiment 1.Accordingly, the amount of computation for MIMO demapping is notincreased, while making it possible to obtain an effect of increasingreception quality of data by a receiver, by reducing correlation betweenthe two frequency channels (CH-A, CH-B) with respect to transmissionchannel characteristics.

As described above, with respect to the two frequency channels (CH-A,CH-B), one or more of: differentiation of the fixed pre-coding matricesF_A and F_B; differentiation of phase change patterns of the phasechange matrices X_A(k) and X_B(k); and differentiation of interleavingpatterns may be used.

Further, the MIMO-PLP processing unit 332 illustrated in FIG. 10 may bereplaced by a MIMO-PLP processing unit 334 illustrated in FIG. 15. TheMIMO-PLP processing unit 334 illustrated in FIG. 15, compared to theMIMO-PLP processing unit 332 illustrated in FIG. 10, is configured suchthat the mapping unit 2073B and the MIMO coding unit 376B are replacedby a mapping unit 373B and the MIMO coding unit 377B, respectively.Further, the two interleaving units 2074-3 and 2074-4 corresponding tothe frequency channel B (CH-B) are replaced by the interleaving units174-3 and 174-4, respectively.

The mapping unit 373B illustrated in FIG. 15 that corresponds to thefrequency channel B (CH-B) may perform mapping of a different pattern tothe mapping unit 2073A illustrated in FIG. 15 that corresponds to thefrequency channel A (CH-A). Use of uniform mapping by one of the mappingunits 2073A and 373B, and non-uniform mapping by the other one of themapping units 2073A and 373B is given as an example of use of differentpatterns, but the present invention is not limited in this way.64-quadrature amplitude modulation (QAM) and non-uniform (NU) 64-QAM,which are described in Non-Patent Literature 3, are given as examples ofuniform mapping and non-uniform mapping, respectively, but the presentinvention is not limited in this way. In this way, it is possible toobtain an effect of increasing reception quality of data by a receiver,by reducing correlation between the two frequency channels (CH-A, CH-B)with respect to transmission channel characteristics.

The MIMO coding unit 377B, the interleaving unit 174-3, and theinterleaving unit 174-4 perform the same operations as described withreference to FIG. 14.

As described above, with respect to the two frequency channels (CH-A,CH-B), one or more of: differentiation of the mapping pattern;differentiation of the fixed pre-coding matrices F_A and F_B;differentiation of phase change patterns of the phase change matricesX_A(k) and X_B(k); and differentiation of interleaving patterns may beused.

Further, the L1 information processing unit 341 illustrated in FIG. 11may be replaced by an L1 information processing unit 343 illustrated inFIG. 16. The L1 information processing unit 343 illustrated in FIG. 16,compared to the L1 information processing unit 341 illustrated in FIG.11, is configured such that the MIMO coding unit 376B is replaced by theMIMO coding unit 377B. The MIMO coding unit 377B performs the sameoperations as the MIMO coding unit 377B illustrated in FIG. 14. In thisway, it is possible to obtain an effect of increasing reception qualityof data by a receiver, by reducing correlation between the two frequencychannels (CH-A, CH-B) with respect to transmission channelcharacteristics.

Further, the L1 information processing unit 342 illustrated in FIG. 12may be replaced by an L1 information processing unit 344 illustrated inFIG. 17. The L1 information processing unit 344 illustrated in FIG. 17,compared to the L1 information processing unit 342 illustrated in FIG.12, is configured such that the mapping unit 2083B and the MIMO codingunit 376B are replaced by a mapping unit 383B and the MIMO coding unit377B, respectively.

The mapping unit 383B illustrated in FIG. 17 that corresponds to thefrequency channel B (CH-B) may, similar to the mapping unit 373Billustrated in FIG. 15, perform mapping of a different pattern to themapping unit 2083A illustrated in FIG. 17 that corresponds to thefrequency channel A (CH-A). Use of uniform mapping by one of the mappingunits 2083A and 383B, and non-uniform mapping by the other one of themapping units 2083A and 383B is given as an example of use of differentpatterns, but the present invention is not limited in this way. 64-QAMand NU 64-QAM, which are described in Non-Patent Literature 3, are givenas examples of uniform mapping and non-uniform mapping, respectively,but the present invention is not limited in this way. In this way, it ispossible to obtain an effect of increasing reception quality of data bya receiver, by reducing correlation between the two frequency channels(CH-A, CH-B) with respect to transmission channel characteristics.

Further, the MIMO coding unit 377B performs the same operations as theMIMO coding unit 377B illustrated in FIG. 14. In this way, it ispossible to obtain an effect of increasing reception quality of data bya receiver, by reducing correlation between the two frequency channels(CH-A, CH-B) with respect to transmission channel characteristics.

As described above, with respect to the two frequency channels (CH-A,CH-B), one or more of: differentiation of mapping patterns;differentiation of the fixed pre-coding matrices F_A and F_B; anddifferentiation of phase change patterns of the phase change matricesX_A(k) and X_B(k) may be used.

<Modification of Receiver and Reception Method>

FIG. 18 illustrates a configuration of a receiver 450 corresponding to acase in which the MIMO-PLP processing unit 333 illustrated in FIG. 14 orthe MIMO-PLP processing unit 334 illustrated in FIG. 15, and the L1information processing unit 343 illustrated in FIG. 16 or the L1information processing unit 344 illustrated in FIG. 17 are used. Thereceiver 450 illustrated in FIG. 18, compared to the receiver 400illustrated in FIG. 13, is configured such that the PLP de-interleavingunit 221B and the MIMO de-mapping unit 432B that correspond to thefrequency channel B (CH-B) are replaced by the PLP de-interleaving unit222B and the MIMO de-mapping unit 434B, respectively. The PLPde-interleaving unit 222B illustrated in FIG. 18 that corresponds to thefrequency channel B (CH-B) performs the same operations as the PLPde-interleaving unit illustrated in FIG. 7. Further, the MIMO de-mappingunit 434B that corresponds to the frequency channel B (CH-B) performsMLD using Formula 26 and Formula 27, taking into consideration thepre-coding matrix F_B shown in Formula 28 instead of the pre-codingmatrix F_B shown in Formula 17. Further, the MIMO de-mapping unit 434Bthat corresponds to the frequency channel B (CH-B) performs MLD usingFormula 26 and Formula 27 taking into consideration the phase changematrix X_B(k) shown in Formula 29 instead of the phase change matrixX_B(k) shown in Formula 19. Furthermore, as with the MIMO-PLP processingunit 334 illustrated in FIG. 15 and the L1 information processing unit344, in a case in which mapping of different patterns is performed withrespect to the frequency channel B (CH-B) and the frequency channel A(CH-A), MLD is performed with this under consideration.

Further, the components of the receiver 450 illustrated in FIG. 18,aside from the tuner unit 205A and 205B, may be included in anintegrated circuit 441.

Embodiment 3

<Transmitter and Transmission Method>

FIG. 19 illustrates a configuration of a transmitter 500 in embodiment3. Components that are the same as in the conventional transmitter orthe transmitter in embodiments 1-2 have the same reference signs, anddescription thereof is omitted here.

The transmitter 500 illustrated in FIG. 19, compared to the transmitter100 in embodiment 1, is configured such that the MIMO-PLP processingunit 131 and the L1 information processing unit 141 are replaced by aMIMO-PLP processing unit 531 and an L1 information processing unit 541,respectively.

FIG. 20 illustrates a configuration of the MIMO-PLP processing unit 531.Compared to the MIMO-PLP processing unit 332 in embodiment 2,illustrated in FIG. 10, the MIMO-PLP processing unit 531 is configuredsuch that a frequency channel interchange unit 591 is added. Further,the S/P conversion unit 379 subsequent to the FEC coding unit 2072 isreplaced by an S/P conversion unit 581 preceding two FEC coding units2072.

The S/P conversion unit 581 illustrated in FIG. 20, with respect tobaseband frames outputted from the input processing unit 2071, allocatesbaseband frames one by one from the start of each frame in turn to theFEC coding unit 2072A, the FEC coding unit 2072B, the FEC coding unit2072A, the FEC coding unit 2072B, . . . .

Operations of the FEC coding unit 2072, the mapping unit 2073, the MIMOcoding unit 376, and the interleaving unit 2074 are the same as theoperations described with reference to FIG. 10. Accordingly, when theFEC blocks of each frame are expressed from the start as FB-1, FB-2,FB-3, FB-4, . . . , FB-Nblocks (where Nblocks equals the number of FECblocks in the frame), for each frame, components of all cell mappingdata (cells) of FB-(2N−1) (N=1, 2, . . . , (Nblocks/2)) are outputtedfrom the interleaving units 2074-1 and 2074-2, which correspond to thefrequency channel A (CH-A). On the other hand, for each frame,components of all mapping data (cells) of FB-2N are outputted from theinterleaving units 2074-3 and 2074-4, which correspond to the frequencychannel B (CH-B).

FIG. 21 illustrates a configuration of the frequency channel interchangeunit 591. The frequency channel interchange unit 591 has four selectors595. The frequency channel interchange unit 591 generates a selectionsignal, and inputs the selection signal to the four selectors 595. Whenthe selection signal is “0”, a selector selects and outputs data that isinputted to “0”. When the selection signal is “1”, a selector selectsand outputs data that is inputted to “1”. As an example, in a case inwhich a selection signal that is generated alternates “0”, “1”, “0”,“1”, . . . , in cell units from the start of each FEC block, an outputdata series of the frequency channel interchange unit 591 is expressedas below.

Tx-1, CH-A: u1_2 k+1 (FB-(2N−1)), u3_2 k+2 (FB-2N)

Tx-2, CH-A: u2_2 k+1 (FB-(2N−1)), u4_2 k+2 (FB-2N)

Tx-1, CH-B: u3_2 k+1 (FB-2N), u1_2 k+2 (FB-2N−1)

Tx-2, CH-B: u4_2 k+1 (FB-2N), u4_2 k+2 (FB-2N−1)

(k=0, 1, . . . , (Ncells/2)−1)

uR_T (FB-L) is a component of mapping data (cell) (T)th from the startof FB-L, which is outputted from the interleaving unit 2074-R, andNcells is the number of cells in an FEC block. In this way, of themapping data (cells) in an FEC block, half of the components thereof aretransmitted via one frequency channel (CH-A) from each of the twotransmit antennas (Tx-1, Tx-2). Further, the remaining half of thecomponents are transmitted via the other frequency channel (CH-B) fromeach of the two transmit antennas (Tx-1, Tx-2).

Note that the selection signal is not limited to having an alternationof “0”, “1”, “0”, “1”, . . . , in cell units from the start of each FECblock. The number of “0”s and “1”s are preferably close to being equal.

FIG. 22 illustrates a configuration of the L1 information processingunit 541. Compared to the L1 information processing unit 342 inembodiment 2, illustrated in FIG. 12, the L1 information processing unit541 is configured such that a frequency channel interchange unit 591 isadded. Further, the S/P conversion unit 379 subsequent to the FEC codingunit 2082 is replaced by an S/P conversion unit 581 preceding two FECcoding units 2082. The S/P conversion unit 581, in the same way as theoperation by the S/P conversion unit 581 illustrated in FIG. 20, withrespect to baseband frames of L1-pre information and L1-post informationoutputted from the L1 information generation unit 181, allocatesbaseband frames one by one from the start of each frame in turn to theFEC coding unit 2082A, the FEC coding unit 2082B, the FEC coding unit2082A, the FEC coding unit 2082B, . . . . Operations of the FEC codingunit 2082, the mapping unit 2083, and the MIMO coding unit 376 are thesame as the operations described with reference to FIG. 12. Operationsof the frequency channel interchange unit 591 are the same as theoperations described with reference to FIG. 21. However, the operationsare performed according to the configuration illustrated in FIG. 21,using MIMO coded data outputted from the MIMO coding unit 376 as input,and outputting to the frame building unit 151. In this way, of themapping data (cells) in an FEC block, half of the components thereof aretransmitted via one frequency channel (CH-A) from each of the twotransmit antennas (Tx-1, Tx-2). Further, the remaining half of thecomponents are transmitted via the other frequency channel (CH-B) fromeach of the two transmit antennas (Tx-1, Tx-2).

According to the above configuration, with regard to MIMO using aplurality of fundamental bands, a transmitter, transmission method, andprogram are provided that sufficiently exhibit a frequency diversityeffect with respect to the plurality of fundamental bands, bytransmitting half of the components of mapping data (cells) of an FECblock via one frequency channel (CH-A) from the two transmit antennas(Tx-1, Tx-2), and the remaining half of the components via anotherfrequency channel (CH-B) from the two transmit antennas (Tx-1, Tx-2). Inparticular, providing an FEC coding unit for each frequency channelusing MIMO, and performing data interchange between frequency channelsafter interleaving are features of the transmitter 500.

<Receiver and Reception Method>

FIG. 23 illustrates a configuration of a receiver 600 in embodiment 3.The receiver 600 illustrated in FIG. 23 corresponds to the transmitter500, illustrated in FIG. 19, and reflects functions of the transmitter500. Components that are the same as in the conventional receiver or thereceiver in embodiments 1-2 have the same reference signs, anddescription thereof is omitted here.

The receiver 600 illustrated in FIG. 23, compared to the receiver 400 inembodiment 2, illustrated in FIG. 13, is configured such that the P/Sconversion unit 435 is replaced by a P/S conversion unit 635. Further, afrequency channel inverse interchange unit 637 is added.

The following describes operations of the receiver 600 illustrated inFIG. 23. The frequency channel inverse interchange unit 637 performs adata interchange that is the inverse of the data interchange performedby the frequency channel interchange unit 591 that is illustrated inFIG. 21. The P/S conversion unit 635 multiplexes and outputs, FEC blockby FEC block, vector estimated values of FEC blocks FB-(2N−1) (N=1, 2, .. . , (Nblocks/2)) of each frame outputted from the MIMO demapping unit432A and vector estimated values of FEC blocks FB-2N of each frameoutputted from the MIMO demapping unit 432B. Other operations of thereceiver 600 are the same as that of the receiver 400 in embodiment 2,illustrated in FIG. 13.

According to the above configuration, with regard to MIMO using aplurality of fundamental bands, a receiver, reception method, andprogram are provided that receive a signal transmitted by transmittinghalf of the components of mapping data (cells) of an FEC block via onefrequency channel (CH-A) from the two transmit antennas (Tx-1, Tx-2),and the remaining half of the components via another frequency channel(CH-B) from the two transmit antennas (Tx-1, Tx-2). In particular, theP/S conversion unit 635 multiplexing and outputting input data FEC blockby FEC block is a feature of the receiver 600. In this way, at the stageof MIMO de-mapping, in cases in which a time of decoding (such as spheredecoding) changes depending on such factors as carrier to noise powerratio (C/N) reception of transmission channels, the receiver 600 has theeffect of making the process of the P/S conversion unit 635 easy.

Further, the components of the receiver 600 illustrated in FIG. 23,aside from the tuner unit 205A and 205B, may be included in anintegrated circuit 640.

<Modification of Transmitter and Transmission Method>

The MIMO-PLP processing unit 531 illustrated in FIG. 20 may be replacedby a MIMO-PLP processing unit 532, illustrated in FIG. 24. The MIMO-PLPprocessing unit 532 illustrated in FIG. 24, compared to the MIMO-PLPprocessing unit 531 illustrated in FIG. 20, is configured such that theFEC coding unit 2072B, the mapping unit 2073B, and the MIMO coding unit376B are replaced by an FEC coding unit 572B, a mapping unit 373B, and aMIMO coding unit 377B, respectively. Further, the two interleaving units2074-3 and 2074-4 are replaced by the interleaving units 174-3 and174-4, respectively.

The FEC coding unit 572B illustrated in FIG. 24 may perform LDPC codingof a different pattern to the FEC coding unit 2072A illustrated in FIG.24. Using a parity check matrix for coding is given as an example of adifferent pattern, but the present invention is not limited in this way.For example, a different coding rate may be used. In this way, it ispossible to obtain an effect of increasing reception quality of data bya receiver, by reducing correlation between the two frequency channels(CH-A, CH-B) with respect to transmission channel characteristics.

Operations of the mapping unit 373B, the MIMO coding unit 377B, and theinterleaving units 174-3 and 174-4 are the same as the operationsdescribed with reference to FIG. 15. Other operations of the MIMO-PLPprocessing unit 532 are the same as that of the MIMO-PLP processing unit531 illustrated in FIG. 20.

As described above, with respect to the two frequency channels (CH-A,CH-B), one or more of: differentiation of LDPC coding patterns;differentiation of mapping patterns; differentiation of the fixedpre-coding matrices F_A and F_B; differentiation of phase changepatterns of the phase change matrices X_A(k) and X_B(k); anddifferentiation of interleaving patterns may be used.

Further, the L1 information processing unit 541 illustrated in FIG. 22may be replaced by an L1 information processing unit 542, illustrated inFIG. 25. The L1 information processing unit 542 illustrated in FIG. 25,compared to the L1 information processing unit 541 illustrated in FIG.22, is configured such that the FEC coding unit 2082B, the mapping unit2083B, and the MIMO coding unit 376B are replaced by an FEC coding unit582B, a mapping unit 383B, and a MIMO coding unit 377B, respectively.

The FEC coding unit 582B illustrated in FIG. 25 may perform LDPC codingof a different pattern to the FEC coding unit 2082A, in the same way asthe FEC coding unit 572B illustrated in FIG. 24. In this way, it ispossible to obtain an effect of increasing reception quality of data bya receiver, by reducing correlation between the two frequency channels(CH-A, CH-B) with respect to transmission channel characteristics.

As described above, with respect to the two frequency channels (CH-A,CH-B), one or more of: differentiation of LDPC coding patterns;differentiation of mapping patterns; differentiation of the fixedpre-coding matrices F_A and F_B; differentiation of phase changepatterns of the phase change matrices X_A(k) and X_B(k); may be used.

<Modification of Receiver and Reception Method>

FIG. 26 illustrates a configuration of a receiver 650 corresponding to acase in which the MIMO-PLP processing unit 532 illustrated in FIG. 24and the L1 information processing unit 542 illustrated in FIG. 25 areused. The receiver 650 illustrated in FIG. 26, compared to the receiver600 illustrated in FIG. 23, is configured such that the PLPde-interleaving unit 221B, the MIMO de-mapping unit 432B, and the FECdecoding unit 233 are replaced by a PLP de-interleaving unit 222B, aMIMO de-mapping unit 434B, and an FEC decoding unit 633. Operations ofthe PLP de-interleaving unit 222B and the MIMO de-mapping unit 434Billustrated in FIG. 26 are the same as the operations described withreference to FIG. 18. The FEC decoding unit 633 performs LDPC decodingusing different parity check polynomials with respect to FEC blocksFB-2N (N=1, 2, . . . , (Nblocks/2)) of each frame outputted from theMIMO de-mapping unit 434B and FEC blocks FB-(2N−1) of each frameoutputted from the MIMO de-mapping unit 432A. Other operations of thereceiver 650 are the same as that of the receiver 600 illustrated inFIG. 23.

Further, the components of the receiver 650 illustrated in FIG. 26,aside from the tuner unit 205A and 205B, may be included in anintegrated circuit 641.

Embodiment 4

<Transmitter and Transmission Method>

FIG. 27 illustrates a configuration of a transmitter 700 in embodiment4. Components that are the same as in the conventional transmitter orthe transmitter in embodiments 1-3 have the same reference signs, anddescription thereof is omitted here.

The transmitter illustrated in FIG. 27, compared to the transmitter 500in embodiment 3, illustrated in FIG. 19, is configured such that theMIMO-PLP processing unit 531 is replaced by a MIMO-PLP processing unit731.

FIG. 28 illustrates a configuration of the MIMO-PLP processing unit 731.Compared to the MIMO-PLP processing unit 531 in embodiment 3 illustratedin FIG. 20, the MIMO-PLP processing unit 731 is configured such that theposition of the frequency channel interchange unit 591 is changed frombeing subsequent to the interleaving units 2074 to preceding theinterleaving units 2074.

The frequency channel interchange unit 591 illustrated in FIG. 28performs the same operations as described in embodiment 3. The frequencychannel interchange unit 591 operates according to the configurationillustrated in FIG. 21, using MIMO coded data outputted from the MIMOcoding units 376 as input, and outputting to the interleaving units2074. Other operations of the MIMO-PLP processing unit 731 are the sameas that of the MIMO-PLP processing unit 531 illustrated in FIG. 20. Inthis way, of the mapping data (cells) in an FEC block, half of thecomponents thereof are transmitted via one frequency channel (CH-A) fromeach of the two transmit antennas (Tx-1, Tx-2). Further, the remaininghalf of the components are transmitted via the other frequency channel(CH-B) from each of the two transmit antennas (Tx-1, Tx-2).

According to the above configuration, with regard to MIMO using aplurality of fundamental bands, a transmitter, transmission method, andprogram are provided that sufficiently exhibit a frequency diversityeffect with respect to the plurality of fundamental bands, bytransmitting half of the components of mapping data (cells) of an FECblock via one frequency channel (CH-A) from the two transmit antennas(Tx-1, Tx-2), and the remaining half of the components via anotherfrequency channel (CH-B) from the two transmit antennas (Tx-1, Tx-2). Inparticular, providing an FEC coding units for each frequency channelusing MIMO and performing data interchange between frequency channelsafter MIMO coding are features of the transmitter 700.

<Receiver and Reception Method>

FIG. 29 illustrates a configuration of a receiver 800 in embodiment 4.The receiver 800 illustrated in FIG. 29 corresponds to the transmitter700, illustrated in FIG. 27, and reflects functions of the transmitter700. Components that are the same as in the conventional receiver or thereceiver in embodiments 1-3 have the same reference signs, anddescription thereof is omitted here. The receiver 800 illustrated inFIG. 29, compared to the receiver 600 in embodiment 3, illustrated inFIG. 23, is configured such that a position of the frequency channelinverse interchange unit 637 is changed from preceding the PLPde-interleaving units 221 to preceding the MIMO de-mapping units 432.

The frequency channel inverse interchange unit 637 illustrated in FIG.29 performs the same operations as in embodiment 3, performing datainterchange that is the inverse of that performed by the frequencychannel interchange unit 591, illustrated in FIG. 28. Other operationsof the receiver 800 are the same as that of the receiver 600 inembodiment 3, illustrated in FIG. 23.

According to the above configuration, with regard to MIMO using aplurality of fundamental bands, a receiver, reception method, andprogram are provided that receive a signal transmitted by transmittinghalf of the components of mapping data (cells) of an FEC block via onefrequency channel (CH-A) from the two transmit antennas (Tx-1, Tx-2),and the remaining half of the components via another frequency channel(CH-B) from the two transmit antennas (Tx-1, Tx-2). In particular, theP/S conversion unit 635 multiplexing and outputting input data FEC blockby FEC block is a feature of the receiver 800. In this way, at the stageof MIMO de-mapping, in cases in which a time of decoding (such as spheredecoding) changes depending on such factors as carrier to noise powerratio (C/N) reception of transmission channels, the receiver 600 has theeffect of making the process of the P/S conversion unit 635 easy.

Further, the components of the receiver 800 illustrated in FIG. 29,aside from the tuner unit 205A and 205B, may be included in anintegrated circuit 840.

<Modification of Transmitter and Transmission Method>

The MIMO-PLP processing unit 731 illustrated in FIG. 28 may be replacedby a MIMO-PLP processing unit 732, illustrated in FIG. 30. The MIMO-PLPprocessing unit 732 illustrated in FIG. 30, compared to the MIMO-PLPprocessing unit 731 illustrated in FIG. 28, is configured such that theFEC coding unit 2072B, the mapping unit 2073B, and the MIMO coding unit376B are replaced by the FEC coding unit 572B, the mapping unit 373B,and the MIMO coding unit 377B. Further, the two interleaving units2074-3 and 2074-4 are replaced by the interleaving units 174-3 and174-4, respectively.

Operations of the FEC coding unit 572B, the mapping unit 373B, the MIMOcoding unit 377B, and the interleaving units 174-3 and 174-4 illustratedin FIG. 30 are the same as the operations described with reference toFIG. 24. Other operations of the MIMO-PLP processing unit 732 are thesame as that of the MIMO-PLP processing unit 731 illustrated in FIG. 28.In this way, it is possible to obtain an effect of increasing receptionquality of data by a receiver, by reducing correlation between the twofrequency channels (CH-A, CH-B) with respect to transmission channelcharacteristics.

As described above, with respect to the two frequency channels (CH-A,CH-B), one or more of: differentiation of the LDPC coding patterns;differentiation of the mapping patterns; differentiation of the fixedpre-coding matrices F_A and F_B; differentiation of phase changepatterns of the phase change matrices X_A(k) and X_B(k); anddifferentiation of interleaving patterns may be used.

<Modification of Receiver and Reception Method>

FIG. 31 illustrates a configuration of a receiver 850 corresponding to acase in which the MIMO-PLP processing unit 732 illustrated in FIG. 30 isused. The receiver 850 illustrated in FIG. 31, compared to the receiver800 illustrated in FIG. 29, is configured such that the PLPde-interleaving unit 221B, the MIMO de-mapping unit 432B, and the FECdecoding unit 233 are replaced by the PLP de-interleaving unit 222B, theMIMO de-mapping unit 434B, and the FEC decoding unit 633, respectively.Operations of the PLP de-interleaving unit 222B, the MIMO de-mappingunit 434B, and the FEC decoding unit 633 illustrated in FIG. 31 are thesame as the operations described with reference to FIG. 26. Otheroperations of the receiver 850 are the same as that of the receiver 800illustrated in FIG. 29.

Further, the components of the receiver 850 illustrated in FIG. 31,aside from the tuner unit 205A and 205B, may be included in anintegrated circuit 841.

Embodiment 5

<Transmitter and Transmission Method>

FIG. 32 illustrates a configuration of a transmitter 900 in embodiment5. Components that are the same as in the conventional transmitter orthe transmitter in embodiments 1-4 have the same reference signs, anddescription thereof is omitted here.

The transmitter 900 illustrated in FIG. 32, compared to the transmitter100 in embodiment 1, is configured such that the MIMO-PLP processingunit 131 and the L1 information processing unit 141 are replaced by aMIMO-PLP processing unit 931 and an L1 information processing unit 941,respectively.

FIG. 33 illustrates a configuration of the MIMO-PLP processing unit 931.Compared to the MIMO-PLP processing unit 731 in embodiment 4,illustrated in FIG. 28, the MIMO-PLP processing unit 931 is configuredsuch that the frequency channel interchange unit 591 preceding theinterleaving units 2074 is replaced by a frequency channel interchangeunit 991 preceding the MIMO coding units 376.

FIG. 34 illustrates a configuration of the frequency channel interchangeunit 991. The frequency channel interchange unit 991 has two selectors595. The frequency channel interchange unit 991 generates a selectionsignal, and inputs the selection signal to the two selectors 595. Whenthe selection signal is “0”, a selector selects and outputs data that isinputted to “0”. When the selection signal is “1”, a selector selectsand outputs data that is inputted to “1”. As an example, in a case inwhich a selection signal that is generated alternates “0”, “0”, “1”,“1”, “0”, “0”, “1”, “1”, . . . , in units of two cells from the start ofeach FEC block, an output data series of the frequency channelinterchange unit 991 is expressed as below.

Output to the MIMO coding unit 376A: vA_2 k+1 (FB-(2N−1)), vA_2 k+2(FB-(2N−1)), vB_2 k+3 (FB-2N), vB_2 k+4 (FB-2N)

Output to the MIMO coding unit 376B: vB_2 k+1 (FB-2N), vB_2 k+2 (FB-2N),vA_2 k+3 (FB-(2N−1)), vA_2 k+4 (FB-(2N−1))

(k=0, 1, . . . , (Ncells/2)−1) (N=1, 2, . . . , (Nblocks/2))

vA_T (FB-L) is mapping data (cells) (T)th from the start of FB-L that isoutputted from the mapping unit 2073A, vB_T (FB-L) is mapping data(cells) (T)th from the start of FB-L that is outputted from the mappingunit 2073B, Ncells is the number of cells in an FEC block, and Nblocksis the number of FEC blocks in a frame. Note that the selection signalis not limited to having an alternation of “0”, “0”, “1”, “1”, “0”, “0”,“1”, “1”, . . . , in units of two cells from the start of each FECblock. The number of “0”s and “1”s are preferably close to being equal.

Accordingly, mapping data (cells) of FB-(2N−1) and FB-2N are alternatelyinputted in units of two cells to the MIMO coding units 376A and 376Bthat are illustrated in FIG. 33. The MIMO coding units 376A and 376B, asin the operations described with reference to FIG. 9, each performpre-coding in units of two cells, and output each cell to the twotransmit antennas (Tx-1, Tx-2).

Other operations of the MIMO-PLP processing unit 931 illustrated in FIG.33 are the same as that of the MIMO-PLP processing unit 731 illustratedin FIG. 28. In this way, of the mapping data (cells) in an FEC block,half of the components thereof are transmitted via one frequency channel(CH-A) from each of the two transmit antennas (Tx-1, Tx-2). Further, theremaining half of the components are transmitted via the other frequencychannel (CH-B) from each of the two transmit antennas (Tx-1, Tx-2).

FIG. 35 illustrates a configuration of the L1 information processingunit 941. Compared to the L1 information processing unit 541 inembodiment 3, illustrated in FIG. 22, the L1 information processing unit941 is configured such that the frequency channel interchange unit 591subsequent to the MIMO coding units 376 is replaced by the frequencychannel interchange unit 991 preceding the MIMO coding units 376.Operations of the frequency channel interchange unit 991 are the same asthe operations described with reference to FIG. 34. However, operationsare performed according to the configuration illustrated in FIG. 34,using mapping data (cells) outputted from the mapping units 2083, andoutputting to the MIMO coding units 376. In this way, of the mappingdata (cells) in an FEC block, half of the components thereof aretransmitted via one frequency channel (CH-A) from each of the twotransmit antennas (Tx-1, Tx-2). Further, the remaining half of thecomponents are transmitted via the other frequency channel (CH-B) fromeach of the two transmit antennas (Tx-1, Tx-2).

According to the above configuration, with regard to MIMO using aplurality of fundamental bands, a transmitter, transmission method, andprogram are provided that sufficiently exhibit a frequency diversityeffect with respect to the plurality of fundamental bands, bytransmitting half of the components of mapping data (cells) of an FECblock via one frequency channel (CH-A) from the two transmit antennas(Tx-1, Tx-2), and the remaining half of the components via anotherfrequency channel (CH-B) from the two transmit antennas (Tx-1, Tx-2). Inparticular, providing an FEC coding unit for each frequency channelusing MIMO, and performing data interchange between frequency channelsafter mapping are features of the transmitter 900.

<Receiver and Reception Method>

FIG. 36 illustrates a configuration of a receiver 1000 in embodiment 5.The receiver 1000 illustrated in FIG. 36 corresponds to the transmitter900, illustrated in FIG. 32, and reflects functions of the transmitter900. Components that are the same as in the conventional receiver or thereceiver in embodiments 1-4 have the same reference signs, anddescription thereof is omitted here. The receiver 1000 illustrated inFIG. 36, compared to the receiver 800 in embodiment 4, illustrated inFIG. 29, is configured such that the frequency channel inverseinterchange unit 637 preceding the MIMO de-mapping unit 432 is replacedby a frequency channel inverse interchange unit 1037 preceding the P/Sconversion unit 635.

The frequency channel inverse interchange unit 1037 illustrated in FIG.36 performs data interchange that is the inverse of that performed bythe frequency channel interchange unit 991, illustrated in FIG. 34.Other operations of the receiver 1000 are the same as that of thereceiver 800 in embodiment 4, illustrated in FIG. 29.

According to the above configuration, with regard to MIMO using aplurality of fundamental bands, a receiver, reception method, andprogram are provided that receive a signal transmitted by transmittinghalf of the components of mapping data (cells) of an FEC block via onefrequency channel (CH-A) from the two transmit antennas (Tx-1, Tx-2),and the remaining half of the components via another frequency channel(CH-B) from the two transmit antennas (Tx-1, Tx-2). In particular, theP/S conversion unit 635 multiplexing and outputting input data FEC blockby FEC block is a feature of the receiver 1000. In this way, at thestage of MIMO de-mapping, in cases in which a time of decoding (such assphere decoding) changes depending on such factors as carrier to noisepower ratio (C/N) reception of transmission channels, the receiver 600has the effect of making the process of the P/S conversion unit 635easy.

Further, the components of the receiver 1000 illustrated in FIG. 36,aside from the tuner unit 205A and 205B, may be included in anintegrated circuit 1040.

<Modification of Transmitter and Transmission Method>

The MIMO-PLP processing unit 931 illustrated in FIG. 33 may be replacedby a MIMO-PLP processing unit 932, illustrated in FIG. 37. The MIMO-PLPprocessing unit 932 illustrated in FIG. 37, compared to the MIMO-PLPprocessing unit 931 illustrated in FIG. 33, is configured such that theFEC coding unit 2072B, the mapping unit 2073B, and the MIMO coding unit376B are replaced by the FEC coding unit 572B, the mapping unit 373B,and the MIMO coding unit 377B, respectively. Further, the twointerleaving units 2074-3 and 2074-4 are replaced by the interleavingunits 174-3 and 174-4, respectively. Operations of the FEC coding unit572B, the mapping unit 373B, the MIMO coding unit 377B, and theinterleaving units 174-3 and 174-4 illustrated in FIG. 37 are the sameas the operations described with reference to FIG. 24. Other operationsof the MIMO-PLP processing unit 932 are the same as that of the MIMO-PLPprocessing unit 931 illustrated in FIG. 33. In this way, it is possibleto obtain an effect of increasing reception quality of data by areceiver, by reducing correlation between the two frequency channels(CH-A, CH-B) with respect to transmission channel characteristics.

As described above, with respect to the two frequency channels (CH-A,CH-B), one or more of: differentiation of LDPC coding patterns;differentiation of mapping patterns; differentiation of the fixedpre-coding matrices F_A and F_B; differentiation of phase changepatterns of the phase change matrices X_A(k) and X_B(k); anddifferentiation of interleaving patterns may be used.

Further, the L1 information processing unit 941 illustrated in FIG. 35may be replaced by an L1 information processing unit 942, illustrated inFIG. 38. The L1 information processing unit 942 illustrated in FIG. 38,compared to the L1 information processing unit 941 illustrated in FIG.35, is configured such that the FEC coding unit 2082B, the mapping unit2083B, and the MIMO coding unit 376B are replaced by the FEC coding unit582B, the mapping unit 383B, and the MIMO coding unit 377B,respectively. Operations of the FEC coding unit 582B, the mapping unit383B, and the MIMO coding unit 377B illustrated in FIG. 38 are the sameas the operations described with reference to FIG. 25. Other operationsof the L1 information processing unit 942 are the same as that of the L1information processing unit 941 illustrated in FIG. 35. In this way, itis possible to obtain an effect of increasing reception quality of databy a receiver, by reducing correlation between the two frequencychannels (CH-A, CH-B) with respect to transmission channelcharacteristics.

As described above, with respect to the two frequency channels (CH-A,CH-B), one or more of: differentiation of LDPC coding patterns;differentiation of mapping patterns; differentiation of the fixedpre-coding matrices F_A and F_B; and differentiation of phase changepatterns of the phase change matrices X_A(k) and X_B(k) may be used.

<Modification of Receiver and Reception Method>

FIG. 39 illustrates a configuration of a receiver 1050 corresponding toa case in which the MIMO-PLP processing unit 932 illustrated in FIG. 37and the L1 information processing unit 942 illustrated in FIG. 38 areused. The receiver 1050 illustrated in FIG. 39, compared to the receiver1000 illustrated in FIG. 36, is configured such that the PLPde-interleaving unit 221B, the MIMO de-mapping unit 432B, and the FECdecoding unit 233 are replaced by the PLP de-interleaving unit 222B, theMIMO de-mapping unit 434B, and the FEC decoding unit 633. Operations ofthe PLP de-interleaving unit 222B, the MIMO de-mapping unit 434B, andthe FEC decoding unit 633 illustrated in FIG. 39 are the same as theoperations described with reference to FIG. 26. Other operations of thereceiver 1050 are the same as that of the receiver 1000 illustrated inFIG. 36.

However, in the MIMO-PLP processing unit 932 illustrated in FIG. 37 andthe L1 information processing unit 942 illustrated in FIG. 38, in a casein which a mapping unit performs cell mapping of different patterns forfrequency channel A (CH-A) and frequency channel B (CH-B), the MIMOde-mapping units 432A and 434B each perform processing taking intoaccount the cell mapping of different patterns.

Further, the components of the receiver 1050 illustrated in FIG. 39,aside from the tuner unit 205A and 205B, may be included in anintegrated circuit 1041.

Embodiment 6

<Transmitter and Transmission Method>

FIG. 40 illustrates a configuration of a transmitter 1100 in embodiment6. Components that are the same as in the conventional transmitter orthe transmitter in embodiments 1-5 have the same reference signs, anddescription thereof is omitted here.

The transmitter 1100 illustrated in FIG. 40, compared to the transmitter100 in embodiment 1, illustrated in FIG. 1, is configured such that theMIMO-PLP processing unit 131 and the L1 information processing unit 141are replaced by a MIMO-PLP processing unit 1131 and an L1 informationprocessing unit 1141, respectively.

FIG. 41 illustrates a configuration of the MIMO-PLP processing unit1131. Compared to the MIMO-PLP processing unit 931 in embodiment 5illustrated in FIG. 33, the MIMO-PLP processing unit 1131 is configuredsuch that the frequency channel interchange unit 991 preceding the MIMOcoding units 376 is replaced by a frequency channel interchange unit1191 preceding the mapping units 2073.

FIG. 42 illustrates a configuration of the frequency channel interchangeunit 1191. The frequency channel interchange unit 1191 has two selectors1195.

The frequency channel interchange unit 1191 generates a selectionsignal, and inputs the selection signal to the two selectors 1195. Whenthe selection signal is “0”, a selector selects data (FEC framesoutputted from the FEC coding units 2072) that is inputted to “0” andoutputs such data to the mapping unit 2073. When the selection signal is“1”, a selector selects and outputs data that is inputted to “1”. As anexample, in a case in which the modulation scheme is 16-QAM and aselection signal that is generated alternates “0”, “0”, “0”, “0”, “0”,“0”, “0”, “0”, “1”, “1”, “1”, “1”, “1”, “1”, . . . , corresponding tobit groups (in this example, groups of 8 bits) in mapping data (cells)two by two from the start of each FEC block, an output data series ofthe mapping units 2073, which are subsequent to the frequency channelinterchange unit 1191, is the same as that of the MIMO-PLP processingunit 931 in embodiment 5.

Accordingly, mapping data (cells) of FB-(2N−1) and FB-2N are alternatelyinputted in units of two cells to the MIMO coding units 376A and 376Bthat are illustrated in FIG. 41.

Other operations of the MIMO-PLP processing unit 1131 illustrated inFIG. 41 are the same as that of the MIMO-PLP processing unit 931illustrated in FIG. 33. In this way, of the mapping data (cells) in anFEC block, half of the components thereof are transmitted via onefrequency channel (CH-A) from each of the two transmit antennas (Tx-1,Tx-2). Further, the remaining half of the components are transmitted viathe other frequency channel (CH-B) from each of the two transmitantennas (Tx-1, Tx-2).

FIG. 43 illustrates a configuration of the L1 information processingunit 1141. Compared to the L1 information processing unit 941 inembodiment 5, illustrated in FIG. 35, the L1 information processing unit1141 is configured such that the frequency channel interchange unit 991preceding the MIMO coding units 376 is replaced by the frequency channelinterchange unit 1191 preceding the mapping units 2083. Operations ofthe frequency channel interchange unit 1191 are the same as theoperations described with reference to FIG. 42. However, the operationsdescribed with reference to FIG. 42 are performed using FEC framesoutputted from the FEC coding units 2082 as input, and output is to themapping units 2083. In this way, of the mapping data (cells) in an FECblock, half of the components thereof are transmitted via one frequencychannel (CH-A) from each of the two transmit antennas (Tx-1, Tx-2).Further, the remaining half of the components are transmitted via theother frequency channel (CH-B) from each of the two transmit antennas(Tx-1, Tx-2).

According to the above configuration, with regard to MIMO using aplurality of fundamental bands, a transmitter, transmission method, andprogram are provided that sufficiently exhibit a frequency diversityeffect with respect to the plurality of fundamental bands, bytransmitting half of the components of mapping data (cells) of an FECblock via one frequency channel (CH-A) from the two transmit antennas(Tx-1, Tx-2), and the remaining half of the components via anotherfrequency channel (CH-B) of the two transmit antennas (Tx-1, Tx-2). Inparticular, providing an FEC coding unit for each frequency channelusing MIMO, and performing data interchange between frequency channelsbefore mapping are features of the transmitter 1100.

<Receiver and Reception Method>

The receiver in embodiment 6, pertaining to an aspect of the presentinvention, uses the same configuration as the receiver 1000 inembodiment 5, illustrated in FIG. 36.

<Modification of Transmitter and Transmission Method>

The MIMO-PLP processing unit 1131 illustrated in FIG. 41 may be replacedby a MIMO-PLP processing unit 1132 illustrated in FIG. 44. The MIMO-PLPprocessing unit 1132 illustrated in FIG. 44, compared to the MIMO-PLPprocessing unit 1131 illustrated in FIG. 41, is configured such that theFEC coding unit 2072B, the mapping unit 2073B, and the MIMO coding unit376B are replaced by the FEC coding unit 572B, the mapping unit 373B,and the MIMO coding unit 377B. Further, the two interleaving units2074-3 and 2074-4 are replaced by the interleaving units 174-3 and174-4, respectively.

Operations of the FEC coding unit 572B, the mapping unit 373B, the MIMOcoding unit 377B, and the interleaving units 174-3 and 174-4 illustratedin FIG. 44 are the same as the operations described with reference toFIG. 24. Other operations of the MIMO-PLP processing unit 1132 are thesame as that of the MIMO-PLP processing unit 1131 illustrated in FIG.41. In this way, it is possible to obtain an effect of increasingreception quality of data by a receiver, by reducing correlation betweenthe two frequency channels (CH-A, CH-B) with respect to transmissionchannel characteristics.

As described above, with respect to the two frequency channels (CH-A,CH-B), one or more of: differentiation of LDPC coding patterns;differentiation of mapping patterns; differentiation of the fixedpre-coding matrices F_A and F_B; differentiation of phase changepatterns of the phase change matrices X_A(k) and X_B(k); anddifferentiation of interleaving patterns may be used.

Further, the L1 information processing unit 1141 illustrated in FIG. 43may be replaced by an L1 information processing unit 1142 illustrated inFIG. 45. The L1 information processing unit 1142 illustrated in FIG. 45,compared to the L1 information processing unit 1141 illustrated in FIG.43, is configured such that the FEC coding unit 2082B, the mapping unit2083B, and the MIMO coding unit 376B are replaced by the FEC coding unit582B, the mapping unit 383B, and the MIMO coding unit 377B. Operationsof the FEC coding unit 582B, the mapping unit 383B, and the MIMO codingunit 377B illustrated in FIG. 45 are the same as the operationsdescribed with reference to FIG. 25. Other operations of the L1information processing unit 1142 are the same as that of the L1information processing unit 1141 illustrated in FIG. 43. In this way, itis possible to obtain an effect of increasing reception quality of databy a receiver, by reducing correlation between the two frequencychannels (CH-A, CH-B) with respect to transmission channelcharacteristics.

As described above, with respect to the two frequency channels (CH-A,CH-B), one or more of: differentiation of LDPC coding patterns;differentiation of mapping patterns; differentiation of the fixedpre-coding matrices F_A and F_B; and differentiation of phase changepatterns of the phase change matrices X_A(k) and X_B(k) may be used.

<Modification of Receiver and Reception Method>

A receiver corresponding to a case in which the MIMO-PLP processing unit1132 illustrated in FIG. 44 and the L1 information processing unit 1142illustrated in FIG. 45 are used may use the same configuration as thereceiver 1050 in embodiment 5, illustrated in FIG. 39.

Embodiment 7

<Transmitter and Transmission Method>

FIG. 46 illustrates a configuration of a transmitter 1300 in embodiment7. Components that are the same as in the conventional transmitter orthe transmitter in embodiments 1-6 have the same reference signs, anddescription thereof is omitted here. In embodiment 7, at a transportstream (TS) generation unit 1210, a video base layer (video B) and avideo enhancement layer (video E) are generated as video componentsusing scalable video coding (SVC). In this way, audio, video B, andvideo E are allocated to PLPs component by component, and, for each PLP,MIMO using a plurality of fundamental bands and MIMO using a singlefundamental band may be selected.

The transmitter 1300 illustrated in FIG. 46, compared to the transmitter300 in embodiment 2, illustrated in FIG. 8, is configured such that theL1 information processing unit 341 and the frame building unit 151 arereplaced by an L1 information processing unit 1341 and a frame buildingunit 1351. Further, two PLP allocation units 1321 and two MIMO-PLPprocessing units 2031 are added.

FIG. 47 illustrates a configuration of a TS generation unit 1210. The TSgeneration unit 1210 illustrated in FIG. 47 shows an example in which asingle program is generated in a TS, and has one each of an audio codingunit 1221 and a video coding unit 1222. Further, the TS generation unit1210 has packetization units 1223 on a one-for-one basis for the servicecomponents (audio, video B, and video E) in programs. Further, the TSgeneration unit 1210 has a packetized stream multiplexing unit 1224 anda layer 2 (L2) information processing unit 1225.

In the TS generation unit 1210, the audio coding unit 1221 performsinformation source coding of audio. The video coding unit 1222 performsinformation source coding of video using SVC, and generates the twocomponents, video B and video E. H.264, HEVC (H.265), etc., are examplesof information source coding.

Each packetization unit 1223 packetizes output of the audio coding unit1221 or the video coding unit 1222. The L2 information processing unit1225 generates L2 information such as program-specific information(PSI), system information (SI), etc. The packetized stream multiplexingunit 1224 generates a TS by multiplexing output of the packetizationunit 1223 and output of the L2 information processing unit 1225, andoutputs the TS to the transmitter 1300 illustrated in FIG. 46.

In the transmitter 1300 illustrated in FIG. 46, the PLP allocation units1321 allocates to PLPs the service components (audio, video B, and videoE) included in each program and L2 information of TSs outputted from theTS generation units 1210. In FIG. 46, as one example, the PLP allocationunits 1321 allocate as follows:

PLP-1: Audio, video B, and L2 information of program-1 of TS-1

PLP-2: Video E of program-1 of TS-1

PLP-3: Audio, video B, and L2 information of program-1 of TS-2

PLP-4: Video E of program-1 of TS-2

In the example illustrated in FIG. 46, the packets of audio, video B,and L2 information that are to be inputted to one of the MIMO-PLPprocessing units 2031 are actually multiplexed into a single input.Operations of each of the MIMO-PLP processing units 2031 are the same asthe operations described with reference to FIG. 55. Further, whenpackets of video E are inputted, operations of each of the MIMO-PLPprocessing units 331 are the same as the operations described withreference to FIG. 9.

FIG. 48 illustrates a configuration of the L1 information processingunit 1341. The L1 information processing unit 1341, compared to the L1information processing unit 2041, which is conventional technologyillustrated in FIG. 56, is configured such that the L1 informationgeneration unit 2081 is replaced by an L1 information generation unit1381. Further, the L1 information processing unit 1341 has, on aone-for-one basis for each frequency channel, the FEC coding units 2082,the mapping units 2083, and the MIMO coding units 2076.

The L1 information generation unit 1381 illustrated in FIG. 48 generatestransmission parameters related to the two frequency channels (CH-A,CH-B). Operations of the FEC coding units 2082, the mapping units 2083,and the MIMO coding units 2076 are the same as the operations describedwith reference to FIG. 56.

The frame building unit 1351 illustrated in FIG. 46 generates andoutputs transmission frames, by using (i) mapping data of PLP-1outputted from the MIMO-PLP processing unit 2031-1 with respect to onefrequency channel (CH-A) of the two transmit antennas (Tx-1, Tx-2), (ii)mapping data of PLP-3 outputted from the MIMO-PLP processing unit 2031-3with respect to the other frequency channel (CH-B) of the two transmitantennas (Tx-1, Tx-2), (iii) mapping data of each PLP (PLP-2, PLP-4)outputted from the MIMO-PLP processing units 331 with respect to each ofthe two frequency channels (CH-A, CH-B) of the two transmit antennas(Tx-1, Tx-2), and (iv) mapping data of L1 information outputted from theL1 information processing unit 1341 with respect to each of the twofrequency channels (CH-A, CH-B) of the two transmit antennas (Tx-1,Tx-2). Differences between the transmitter 1300 and the transmitter 300in embodiment 2, illustrated in FIG. 8, are that the PLPs (PLP-2, PLP-4)of MIMO using the two frequency channels (CH-A, CH-B), the PLP (PLP-1)of MIMO using one frequency channel (CH-A), and the PLP (PLP-3) of MIMOusing the other frequency channel (CH-B) are mixed in a transmissionframe.

Operations of the OFDM signal generation units 2061, the D/A conversionunits 2091, the frequency conversion units 2096, and the frequencyconversion units 196 are the same as the operations described withreference to FIG. 8.

According to the above configuration, audio, video B, and video E areallocated to PLPs component by component, and, for each PLP, MIMO usinga plurality of fundamental bands and MIMO using a single fundamentalband may be selected. In particular, by performing MIMO transmissionusing a single fundamental band for audio, video B, and L1 information,a MIMO receiver that only supports a single fundamental band may receivePLPs of basic information, and basic information portions of a program,for example the program in standard definition, can thereby be enjoyed.

Note that the MIMO-PLP processing units 331 illustrated in FIG. 45 maybe replaced by any one of the MIMO-PLP processing units 131, 132, 332,333, 334, 531, 532, 731, 732, 931, 932, 1131, 1132 illustrated in FIGS.2, 5, 10, 14, 15, 20, 24, 28, 30, 33, 37, 41, 44, respectively.

<Receiver and Reception Method>

FIG. 49 illustrates a configuration of a receiver 1400 in embodiment 7.The receiver 1400 illustrated in FIG. 49 corresponds to the transmitter1300, illustrated in FIG. 46, and reflects functions of the transmitter1300. Components that are the same as in the conventional receiver orthe receiver in embodiments 1-6 have the same reference signs, anddescription thereof is omitted here. The receiver 1400 illustrated inFIG. 49, compared to the receiver 400 in embodiment 2, illustrated inFIG. 13, is configured such that the P/S conversion unit 435 is replacedby a P/S conversion unit 1435.

With respect to L1 information, the P/S conversion unit 1435 illustratedin FIG. 49 multiplexes output from the MIMO de-mapping units 432A and432B FEC block by FEC block, and outputs to the FEC decoding unit 233.Specifically, the P/S conversion unit 1435, with respect to PLPs (PLP-2,PLP-4 in FIG. 46) of MIMO using the two frequency channels (CH-A, CH-B),performs the same operations as the P/S conversion unit 435 illustratedin FIG. 13. Further, the P/S conversion unit 1435, with respect to PLPs(PLP-1 in FIG. 46) of MIMO using one frequency channel (CH-A), selectsoutput from the MIMO de-mapping unit 432A and outputs to the FECdecoding unit 233. Further, the P/S conversion unit 1435, with respectto PLPs (PLP-3 in FIG. 46) of MIMO using the other frequency channel(CH-B), selects output from the MIMO de-mapping unit 432B and outputs tothe FEC decoding unit 233. Other operations of the receiver 1400 are thesame as that of the receiver 400 in embodiment 2, illustrated in FIG.13.

According to the above configuration, audio, video B, and video E areallocated to PLPs component by component, and a receiver, receptionmethod, and program are provided that receive a signal transmitted byselecting, for each PLP, MIMO using a plurality of fundamental bands andMIMO using a single fundamental band. In particular, portions ofextended information of a program are also received, and for example theprogram in high definition can thereby be enjoyed.

Further, the components of the receiver 1400 illustrated in FIG. 49,aside from the tuner unit 205A and 245B, may be included in anintegrated circuit 1440.

Further, as shown in FIG. 50, a receiver 1450 may be configured. Thereceiver 1450 illustrated in FIG. 50, compared to the receiver 1400illustrated in FIG. 49, is configured such that the tuner units 205B,the A/D conversion units 208B, the demodulation units 211B, thefrequency de-interleaving/L1 information de-interleaving units 215B, thePLP de-interleaving units 221B, the selection units 231B, the MIMOde-mapping units 432B, and the P/S conversion unit 1435 are notincluded.

The receiver 1450 illustrated in FIG. 50 is a MIMO receiver that onlysupports a single fundamental band. The two tuner units 205A selectivelyreceive signals of one frequency channel (CH-A) or the other frequencychannel (CH-B), and down-converts the received signals to a predefinedband. Operations of the A/D conversion units 208A, the demodulationunits 211A, the frequency de-interleaving/L1 information de-interleavingunits 215A, the PLP de-interleaving units 221A, the selection units231A, and the MIMO de-mapping units 432A are the same as operationsdescribed with reference to FIG. 49. The FEC decoding unit 233 performsLDPC decoding and BCH decoding with respect to a vector estimate valueof each FEC block outputted from the MIMO de-mapping unit 432A, andoutputs a decoding result.

According to the above configuration, audio, video B, and video E areallocated to PLPs component by component, and a receiver, receptionmethod, and program are provided that receive a signal transmitted byselecting, for each PLP, MIMO using a plurality of fundamental bands andMIMO using a single fundamental band. In particular, reception of PLPsof basic information is possible, and basic information portions of aprogram, for example the program in standard definition, can thereby beenjoyed. Compared to the receiver illustrated in FIG. 49, the receiver1450, as illustrated in FIG. 50, has an effect of reducing circuit scaleby half.

Further, the components of the receiver 1450 illustrated in FIG. 50,aside from the tuner unit 205A, may be included in an integrated circuit1441.

Embodiment 8

<Transmitter and Transmission Method>

FIG. 51 illustrates a configuration of a transmitter 150 in embodiment8. Components that are the same as in the conventional transmitter orthe transmitter in embodiments 1-7 have the same reference signs, anddescription thereof is omitted here. In embodiment 8, in a case in whichthe two frequency channels (CH-A, CH-B) are adjacent, processingsubsequent to the frame building unit treats the two frequency channelsas one.

The transmitter 150 illustrated in FIG. 51, compared to the transmitter100 in embodiment 1 illustrated in FIG. 1, is configured such that fourof the OFDM signal generation units 2061, four of the D/A conversionunits 2091, and two each of the frequency conversion units 2096 and 196are replaced by two OFDM signal generation units 161, two D/A conversionunits 191, and two frequency conversion units 198, respectively.

In the transmitter 150 illustrated in FIG. 51, with respect totransmission frames outputted from the frame building unit 151 that arerelated to the two frequency channels (CH-A, CH-B) of one transmitantenna (Tx-1), the OFDM signal generation unit 161-1 for Tx-1 addspilot signals, performs IFFT, inserts GIs, and inserts the P1 symbol andthe aP1 symbol, treating the two frequency channels (CH-A, CH-B) as one,and outputs a digital baseband transmission signal. The D/A conversionunit 191-1 for Tx-1 performs D/A conversion on the digital basebandtransmission signal for Tx-1 that is outputted from the OFDM signalgeneration unit 161-1, and outputs an analog baseband transmissionsignal. The frequency conversion unit 196-1 for Tx-1 performs frequencyconversion on the frequency channels A and B with respect to the analogbaseband transmission signal outputted from the D/A conversion unit191-1, and outputs an analog RF transmission signal to a transmitantenna that is not illustrated. In this way, the analog RF transmissionsignal related to the two frequency channels (CH-A, CH-B) of Tx-1 istransmitted.

With respect to transmission frames outputted from the frame buildingunit 151 that are related to the two frequency channels (CH-A, CH-B) ofthe other transmit antenna (Tx-2), operations of the OFDM signalgeneration unit 161-2, the D/A conversion unit 191-2, and the frequencyconversion unit 196-2, all for Tx-2, are the same as the operations forTx-1. In this way, the analog RF transmission signal related to the twofrequency channels (CH-A, CH-B) of Tx-2 is transmitted.

Other operations of the transmitter 150 are the same as that of thetransmitter 100 in embodiment 1, illustrated in FIG. 1.

According to the above configuration, with regard to MIMO using aplurality of fundamental bands, a transmitter, transmission method, andprogram are provided that sufficiently exhibit a frequency diversityeffect with respect to the plurality of fundamental bands. Inparticular, with respect to transmission frames outputted from a framebuilding unit, performing processing treating two frequency channels(CH-A, CH-B) as one, for each transmit antenna, is a feature of thetransmitter 150.

Note that with respect to transmission frames outputted from a framebuilding unit, performing processing treating two frequency channels(CH-A, CH-B) as one, for each transmit antenna, may also be applied withrespect to the transmitter in embodiments 2-7.

<Receiver and Reception Method>

FIG. 52 illustrates a configuration of a receiver 270 in embodiment 8.The receiver 270 illustrated in FIG. 52 corresponds to the transmitter150 illustrated in FIG. 51 and the transmitter 100 illustrated in FIG. 1in a case in which the two frequency channels (CH-A, CH-B) are adjacent,and reflects functions of the transmitter 150 and the transmitter 100.Components that are the same as in the conventional receiver or thereceiver in embodiments 1-7 have the same reference signs, anddescription thereof is omitted here. The receiver 270 illustrated inFIG. 52, compared to the receiver 200 in embodiment 1, illustrated inFIG. 4, is configured such that the four tuner units 205, the four A/Dconversion units 208, and the four demodulation units 211 are replacedby two tuner units 206, two A/D conversion units 209, and twodemodulation units 212, respectively. Further, two S/P conversion units214 are added.

In the receiver 270 illustrated in FIG. 52, the tuner unit 206-1 for onereceive antenna (Rx-1) selectively receives a signal of the twofrequency channels (CH-A, CH-B) together, and down-converts the signalto a predefined band. The A/D conversion unit 209-1 for Rx-1 performsA/D conversion on a signal outputted from the tuner unit 206-1 for Rx-1,and outputs a digital reception signal. The demodulation unit 212-1performs OFDM demodulation, and outputs cell data of I/Q coordinates anda transmission channel estimate value. In this way, cell data of I/Qcoordinates and a channel estimate value related to the two frequencychannels (CH-A, CH-B) of Rx-1 are outputted. The S/P conversion unit214-1, with respect to output of the demodulation unit 212-1, outputsdata related to the one frequency channel (CH-A) to the frequencyde-interleaving/L1 information de-interleaving unit 215A-1 and outputsdata related to the other frequency channel (CH-B) to the frequencyde-interleaving/L1 information de-interleaving unit 215B-1.

Operations of the tuner unit 206-2, the A/D conversion unit 209-2, andthe demodulation unit 212-2 for the other receive antenna (Rx-2) are thesame as the operations for Rx-1. In this way, cell data of I/Qcoordinates and a transmission channel estimate value related to the twofrequency channels (CH-A, CH-B) of Rx-2 are outputted. The S/Pconversion unit 214-2, with respect to output of the demodulation unit212-2, outputs data related to the one frequency channel (CH-A) to thefrequency de-interleaving/L1 information de-interleaving unit 215A-2 andoutputs data related to the other frequency channel (CH-B) to thefrequency de-interleaving/L1 information de-interleaving unit 215B-2.

Other operations of the receiver 270 are the same as that of thereceiver 200 in embodiment 1, illustrated in FIG. 4.

According to the above configuration, with regard to MIMO using aplurality of fundamental bands, a receiver, reception method, andprogram are provided that receive a transmitted signal that is caused tosufficiently exhibit a frequency diversity effect with respect to theplurality of fundamental bands. In particular, the tuner units, A/Dconversion units, and demodulation units performing processing treatingtwo frequency channels (CH-A, CH-B) as one, for each receive antenna, isa feature of the receiver 270.

Note that performing processing treating two frequency channels (CH-A,CH-B) as one, for each receive antenna, may also be applied with respectto the receiver in embodiments 2-7.

Further, the components of the receiver 270 illustrated in FIG. 52,aside from the tuner units 206-1 and 206-2, may be included in anintegrated circuit 242.

(Supplement)

The present invention is not limited to the content described in theabove embodiments. Any form of implementation is possible in order toachieve aims of the present invention and related or associated aims.For example, the following implementations are possible.

(1) Embodiments 1-8 are described using the DVB-NGH scheme as a startingpoint. However, the present invention is not limited in this way, andtransmission schemes other than DVB-NGH may be applied to the presentinvention.

(2) In embodiments 1-8, the number of transmit antennas is illustratedas two. However, the present invention is not limited in this way, andthere may be three or more transmit antennas. Further, the number oftransmit antennas and receive antennas may differ from one another.

(3) In embodiments 1-8, the number of frequency channels (fundamentalbands) is illustrated as two. However, the present invention is notlimited in this way, and there may be three or more frequency channels.

(4) In embodiments 1-8, in a case in which there are three or morefundamental bands, allocation of data components included in each codingblock may be performed with respect to all of the fundamental bands, ortwo or more of the fundamental bands.

(5) In embodiments 1-8, different polarization may be applied withrespect to each of the two transmit antennas (Tx-1, Tx-2). Vertical (V)polarity and horizontal (H) polarity are an example of differentpolarities. In this way, the diversity effect can be further increased.Further, with respect to the two frequency channels (CH-A, CH-B), thepolarity allocated to the transmit antenna 1 (Tx-1) and the transmitantenna 2 (Tx-2) may be the same, and may be different.

(6) In embodiments 1-8, phase change is applied with respect to thetransmit antenna 2 (Tx-2). However, the present invention is not limitedin this way, and phase change may be applied with respect to thetransmit antenna 1 (Tx-1). Further a different transmit antenna(transmit antenna 1 (Tx-1), transmit antenna 2 (Tx-2)) may apply a phasechange with respect to a different one of the two frequency channels(CH-A, CH-B).

(7) In embodiment 7, the number of TSs is two, but the present inventionis not limited in this way. Further, the number of programs is describedas one in TS-1 and TS-2, but the present invention is not limited inthis way.

(8) In embodiment 7, the service components are described as audio andvideo, but the present invention is not limited in this way. Datacomponents, etc., may be included. Further, in embodiment 7, aconfiguration that performs scalable coding with respect to video isdescribed. However, the present invention is not limited in this way,and scalable coding may be performed with respect to audio, datacomponents, etc.

(9) In embodiment 7, description is given of video B and video E beinggenerated by SVC. However, the present invention is not limited in thisway. For example, a base view (MVC_B) and a dependent view (MVC_D) maybe generated by multi-view video coding (MVC). In such a case, if MVC_Bis allocated to a PLP and corresponds to MIMO using a single fundamentalband, and MVC_D is allocated to a different PLP and corresponds to MIMOusing a plurality of fundamental bands, a MIMO receiver that onlysupports a single fundamental band could receive a PLP of basicinformation, and basic information portions of a program, for examplethe program in 2D, can thereby be enjoyed. Further, a MIMO receiver thatsupports a plurality of fundamental bands could receive PLPs of basicinformation and extended information such that, for example, a programcan thereby be enjoyed in 3D.

(10) In embodiment 7, audio, video B, and L2 information is described ascorresponding to MIMO using a single fundamental band, and video E isdescribed as corresponding to MIMO using a plurality of fundamentalbands. However, the present invention is not limited in this way. Forexample, audio and L2 information may correspond to multiple-inputsingle-output (MISO) using a single fundamental band, video B maycorrespond to MIMO using a single fundamental band, and video E maycorrespond to MIMO using a plurality of fundamental bands. As anotherexample, audio and L2 information may correspond to single-inputsingle-output (SISO) using a single fundamental band, video B maycorrespond to MISO using a single fundamental band, and video E maycorrespond to MIMO using a plurality of fundamental bands. As describedabove, MISO and SISO may be further used and combined.

(11) Embodiments 1-8 may be implemented by using hardware and software.The above-described embodiments may be implemented or executed by usinga computing device (processor). The computing device or processor maybe, for example, a main processor/general purpose processor, a digitalsignal processor (DSP), an application specific integrated circuit(ASIC), a field programmable gate array (FPGA), other programmable logicdevice, etc. The above-described embodiments may be executed orimplemented by a combination of such devices.

(12) Embodiments 1-8 may be implemented by an arrangement of softwaremodules that are executed by a processor or directly-connected hardware.Further, a combination of a software module and hardware is possible. Asoftware module may be stored on any of a variety of computer-readablestorage media, for example, RAM, EPROM, EEPROM, flash memory, aregister, hard disk, CD-ROM, DVD, etc.

<<Embodiments and Consideration by Inventors (Part 2)>>

Japanese terrestrial television broadcasting completely changed todigital broadcasting in July, 2011 and HDTV services are being providedusing the Integrated Services Digital Broadcasting for TerrestrialTelevision Broadcasting (ISDB-T) scheme as a broadcasting standard. TheISDB-T scheme uses the orthogonal frequency division multiplexing (OFDM)scheme (Non-Patent Literature 4).

FIG. 75 illustrates a configuration of a transmitter 5000 in the ISDB-Tscheme. The transmitter 5000 includes a transport stream (TS)re-multiplexing unit 5011, a Reed-Solomon (RS) coding unit 5021, ahierarchical layer division unit 5031, hierarchical layer processingunits 5041-A, 5041-B, 5041-C, a hierarchical layer combining unit 5051,a time interleaving unit 5061, a frequency interleaving unit 5071, apilot signal generation unit 5081, a transmission multiplexingconfiguration control (TMCC)/auxiliary channel (AC) signal generationunit 5091, a frame building unit 5101, an OFDM signal generation unit5111, a D/A conversion unit 5121, and a frequency conversion unit 5131.

The following describes operations of the transmitter 5000. A pluralityof TSs outputted from an MPEG-2 multiplexing unit (not illustrated) areinputted to the TS re-multiplexing unit 5011. The TS re-multiplexingunit 5011 is for arranging TS packets in an arrangement suitable forsignal processing of data segment units. The TS re-multiplexing unit5011 converts the plurality of TSs to a burst signal format of 188 byteunits and to a single TS, by a clock rate four times that of a fastFourier transform (FFT) sample clock rate. The RS coding unit 5021performs RS coding, and adds parity of 16 bytes to information of 188byte units. The hierarchical layer division unit 5031, when hierarchicallayer transmission is performed, performs hierarchical layer division ofat most three lines (hierarchical layer A, hierarchical layer B,hierarchical layer C) according to a specification made in hierarchicalinformation.

FIG. 76 illustrates a configuration of one of the hierarchical layerprocessing units 5041. The hierarchical layer processing unit 5041includes an energy dispersal unit 5201, a byte interleaving unit 5211, aconvolutional coding unit 5221, a bit interleaving unit 5231, and amapping unit 5241. The hierarchical layer processing unit 5041 performs,with respect to data of a hierarchical layer inputted thereto, digitaldata processing that is primarily error correction coding, interleaving,etc., and carrier modulation. Error correction, interleaving length, andcarrier modulation scheme are set independently for each hierarchicallayer.

The hierarchical layer combining unit 5051 combines hierarchical layersof data of at most three lines (hierarchical layer A, hierarchical layerB, hierarchical layer C) outputted from the hierarchical layerprocessing units 5041-A, 5041-B, 5041-C, respectively.

FIG. 77 illustrates a configuration of the frequency interleaving unit5071. The frequency interleaving unit 5071 includes a segment divisionunit 5301, inter-segment interleaving units 5311-D and 5311-S,intra-segment carrier rotation units 5321-P, 5321-D, and 5321-S, andintra-segment carrier randomizing units 5331-P, 5331-D, and 5331-S. Toeffectively exhibit error correction coding with respect to electricfield fluctuations and multipath interference that occurs in mobilereception, with respect to output from the hierarchical layer combiningunit 5051 the time interleaving unit 5061 performs intra-segmentconvolutional interleaving, and the frequency interleaving unit 5071performs inter-segment and intra-segment interleaving. In the frequencyinterleaving unit 5071, the segment division unit 5301 allocates datasegment numbers 0 to 12 sequentially to a partial reception portion, adifferential modulation portion (segments for which DQPSK is specifiedfor carrier modulation), and a coherent modulation portion (segments forwhich QPSK, 16-QAM, or 64-QAM is specified for carrier modulation). Notethat between the hierarchical layer configuration and data segments,data segments of the same hierarchical layer are successively arranged,and hierarchical layers are named hierarchical layer A, B, and C, inascending order of data segment number. Inter-segment interleaving isperformed on data segments that belong to the same type of modulationportion, even if the hierarchical layers of the data segments aredifferent.

The pilot signal generation unit 5081 generates pilot signals forsynchronization and recovery. With respect to transmission of ahierarchical layer that includes a plurality of transmission parameters,in order to support demodulation/decoding by a receiver, the TMCC/ACsignal generation unit 5091 generates a TMCC signal that is controlinformation and an AC signal that is auxiliary information. The framebuilding unit 5101 builds a transmission frame of the ISDB-T scheme frominformation data outputted from the frequency interleaving unit 5071,the pilot signals for synchronization and recovery outputted from thepilot signal generation unit 5081, and the TMCC signal outputted fromthe TMCC/AC signal generation unit 5091.

FIG. 78 illustrates a segment of the ISDB-T scheme, using a coherentmodulation portion (QPSK, 16-QAM, 64-QAM) of mode 1 as an example. Aspilot signals for synchronization and recovery, scattered pilot (SP)signals are not transmitted for each sub-carrier, but are transmitted bycarrier positions in a frequency (sub-carrier) direction and time(symbol) direction, such that with respect to a symbol of symbol numbern, carrier number k satisfies k=3(n mod 4)+12p (where mod indicates amodulo operation and p is an integer). In other words, as illustrated inFIG. 78, SP signals are arranged so as to be repeated in periods of foursymbols and shifted three carriers with respect to each symbol. SPsignals arranged in this way are modulated to two values in a specificpattern that is determined by the carrier position. Further, carriers ofthe TMCC signal and the AC signal are arranged randomly in a frequencydirection, in order to reduce the effect of periodic dips oftransmission channel characteristics due to multipath interference.According to the ISDB-T scheme, an information transmission signal ismodulated by QPSK, 16-QAM, 64-QAM, etc., and transmitted using carriersin which the SP signals, the TMCC signal, and the AC signal are notplaced.

The OFDM signal generation unit 5111, with respect to a transmissionframe structure of the ISDB-T scheme outputted from the frame buildingunit 5101, performs inverse FFT (IFFT) and guard interval (GI)insertion, and outputs a digital baseband transmission signal of theISDB-T scheme. The D/A conversion unit 5121 performs D/A conversion withrespect to the digital baseband transmission signal of the ISDB-T schemeoutputted from the OFDM signal generation unit 5111, and outputs ananalog baseband transmission signal of the ISDB-T scheme. The frequencyconversion unit 5131 performs frequency conversion to frequency channelY with respect to the analog baseband transmission signal of the ISDB-Tscheme outputted from the D/A conversion unit 5121, and outputs ananalog RF transmission signal of the ISDB-T scheme from a transmitantenna (Tx-1, not illustrated).

Note that UHDTV (ultra HDTV) service, which surpasses the resolution ofHDTV service, is widely being considered. To implement UHDTV service,which has a high bit rate, consideration of a transmission schemecapable of large-capacity transmission with higher frequency-usageefficiency than the ISDB-T scheme is important. For this purpose,introduction of multiple-input multiple-output (MIMO) technology using aplurality of antennas for both transmission and reception is important.

In fixed reception of a receive antenna on a roof, a line of sight (LOS)environment is the typical transmission channel. In such a case,degradation of reception quality is a problem that occurs depending onthe MIMO scheme (Non-Patent Literature 5).

To mitigate this problem, polarization MIMO composed of a plurality ofantennas having different polarization directions (for example, vertical(V) polarization and horizontal (H) polarization) is being considered.In a broadcast system that uses polarization MIMO, a transmitter, forexample, allocates different data signals of multiple lines provided toa broadcasting station to each of a plurality of transmit antennas, andtransmits an OFDM signal by a broadcast wave in the same frequency or abroadcast wave that overlaps frequency bands. The OFDM signal istransmitted via propagation channels of multiple lines, and a receiver,by using a plurality of receive antennas, receives the OFDM signal ofmultiple lines. The receiver, from each OFDM signal of multiple lines,estimates and separates a transfer function of each propagation channelpassed through, and thereby demodulates different data signals ofmultiple lines transmitted from the transmitter.

In polarization MIMO, increasing polarization diversity effect bydispersing forward error correction (FEC) coded data to polarizationantennas is important. Further, in a case in which polarization MIMO isintroduced to national terrestrial television broadcasting, highcompatibility with the existing ISDB-T scheme is important. Further,within the same frequency channel, making it easy to introduce a newscheme by allowing co-existence of the existing ISDB-T scheme and thenew scheme using polarization MIMO is important.

Embodiments 9-12, described below, aim to solve the technical problemsmentioned above, and aim to provide a transmitter, transmission method,receiver, reception method, integrated circuit, and program that useMIMO.

The following is a detailed description of each embodiment, withreference to the drawings.

Embodiment 9

<Transmitter and Transmission Method>

FIG. 57 illustrates a configuration of a transmitter 3000 in embodiment9. Components that are the same as in the conventional transmitter havethe same reference signs, and description thereof is omitted here.

The transmitter 3000 illustrated in FIG. 57, compared to the transmitter5000 that is conventional and illustrated in FIG. 75, is configured suchthat the hierarchical layer processing units 5041-A, 5041-B, 5041-C, thepilot signal generation unit 5081, the TMCC/AC signal generation unit5091, and the frame building unit 5101 are replaced by hierarchicallayer processing units 3041-A, 3041-B, 3041-C, a pilot signal generationunit 3081, a TMCC/AC signal generation unit 3091, and a frame buildingunit 3101, respectively. Further, in the transmitter 3000, thehierarchical layer combining unit 5051, the time interleaving unit 5061,the frequency interleaving unit 5071, the OFDM signal generation unit5111, the D/A conversion unit 5121, and the frequency conversion unit5131 are provided in a plurality, such that each one of the hierarchicallayer combining unit 5051, the time interleaving unit 5061, thefrequency interleaving unit 5071, the OFDM signal generation unit 5111,the D/A conversion unit 5121, and the frequency conversion unit 5131corresponds to one transmit antenna (Tx-1, Tx-2). Note that Tx-1 andTx-2 each use H polarization and V polarization, but Tx-1 and Tx-2 mayuse other combinations of different polarization.

The following describes operations of the transmitter 3000. FIG. 58illustrates a configuration of one of the hierarchical layer processingunits 3041. Compared to the hierarchical layer processing unit 5041,which is conventional and illustrated in FIG. 76, the hierarchical layerprocessing unit 3041 is configured such that a multiple-inputsingle-output (MISO) coding unit 3251, a MIMO coding unit 3261, and aselector 3271 are added. In the hierarchical layer processing unit 3041illustrated in FIG. 58, the MISO coding unit 3251 performs MISO codingwith respect to output from the mapping unit 5241 and outputs MISO codeddata with respect to the two transmit antennas (Tx-1, Tx-2). Alamouticoding is an example of MISO coding, but the present invention is notlimited in this way.

Further, the MIMO coding unit 3261 performs MIMO coding with respect tooutput from the mapping unit 5241 and outputs MIMO coded data withrespect to the two transmit antennas (Tx-1, Tx-2). Specifically, theMIMO coding unit 3261 performs pre-coding using mapping data two-by-two,and outputs MIMO coded data with respect to the two transmit antennas(Tx-1, Tx-2). When mapping data pairs are expressed as s2 k+1, s2 k+2, .. . , with respect to an input vector s=(s2 k+1, s2 k+2)^(T), (k=0, 1, .. . ), an output vector z=(z1_k, z2_k)^(T) is expressed as shown inFormula 30.[Math 30]z=Fs  (Formula 30)

Note that zP_k is outputted data (MIMO coded data) with respect transmitantenna P. F is a fixed pre-coding matrix expressed by Formula 31.

$\begin{matrix}\lbrack {{Math}\mspace{14mu} 31} \rbrack & \; \\{F = \begin{pmatrix}{w11} & {w12} \\{w21} & {w22}\end{pmatrix}} & ( {{Formula}\mspace{14mu} 31} )\end{matrix}$

In Formula 31, each component wMN (M=1, 2, N=1, 2) of the fixedpre-coding matrix is a complex number. However, wMN need not all becomplex numbers, and real number components may be included.

As shown in Formula 32 and Formula 33, pre-coding may be performed byfurther multiplying by a phase change matrix X(k) that regularly changesFormula 30.

$\begin{matrix}\lbrack {{Math}\mspace{14mu} 32} \rbrack & \; \\{z = {{X(k)}{Fs}}} & ( {{Formula}\mspace{14mu} 32} ) \\\lbrack {{Math}\mspace{14mu} 33} \rbrack & \; \\{{X(k)} = \begin{pmatrix}1 & 0 \\0 & e^{j\frac{2\pi}{9}k}\end{pmatrix}} & ( {{Formula}\mspace{14mu} 33} )\end{matrix}$

According to this phase change matrix X(k), with respect to a series ofMIMO coded data for the transmit antenna 2 (Tx-2), a phase change ofperiod 9 is performed that changes in 2π/9 radian steps. Accordingly, bycausing a regular change in a MIMO channel, an effect is obtained bywhich reception quality of data is improved for a receiver in a line ofsight (LOS) environment in which direct waves are dominant. Note thatthis phase change is only one example, and the phase change is notlimited to a period of 9. When the number of this period becomesgreater, the reception performance of the receiver (more precisely, theerror correction performance) may increase proportionately (although alarger period is not always better, the possibility is high that a smallvalue such as 2 is better avoided).

Further, although the phase change shown in Formula 32 and Formula 33indicates rotation of the phase that is sequential and predefined (inthe above formulas, 2π/9 radian steps), rotation is not limited to thesame phase amount and the phase may be changed by a random amount. Theimportance of regularly changing the phase is that the phase of amodulated signal is changed regularly. A degree by which the phase ischanged is preferably uniform, for example, with respect to −π radiansto π radians, uniform distribution is preferable. However, randomdistribution is also possible.

According to the above-described operations performed by the MIMO codingunit 3261, each component of the output vector z is expressed as inFormulas 34-35.[Math 34]z1_k=f1(s2k+1,s2k+2)  (Formula 34)[Math 35]z2_k=f2(s2k+1,s2k+2)  (Formula 35)

Here, f1 and f2 express functions. Accordingly, with respect topolarization MIMO, a transmitter, a transmission method, and a programare provided that each sufficiently exhibits a polarization diversityeffect, by transmitting each component of mapping data from everytransmit antenna.

Further, a fixed pre-coding matrix F shown in Formula 36 may be used.

$\begin{matrix}\lbrack {{Math}\mspace{14mu} 36} \rbrack & \; \\{F = \begin{pmatrix}1 & 0 \\0 & 1\end{pmatrix}} & ( {{Formula}\mspace{14mu} 36} )\end{matrix}$

As shown in Formula 32 and Formula 33, pre-coding may be performed byfurther multiplying by a phase change matrix X(k) that regularly changesFormula 36. According to the above-described operations performed by theMIMO coding unit 3261, each component of the output vector z isexpressed as in Formulas 37-38.[Math 37]z1_k=f1(s2k+1)  (Formula 37)[Math 38]z2_k=f2(s2k+2)  (Formula 38)

Here, f1 and f2 express functions. Accordingly, with respect topolarization MIMO, a transmitter, a transmission method, and a programare provided that each sufficiently exhibits a polarization diversityeffect, by transmitting half of all mapping data from one transmitantenna (Tx-1) and transmitting the remaining half of all mapping datafrom another transmit antenna (Tx-2).

In the hierarchical layer processing unit 3041 illustrated in FIG. 58,the selector 3271 selects and outputs data inputted to “0”, “1”, “2”when a selection signal is “0”, “1”, “2”. In other words, if thehierarchical layers correspond to the existing ISDB-T scheme, MISO andMIMO, the selection signal is “0”, “1”, and “2”, respectively. However,when the selection signal is “0”, a null signal is outputted to

Tx-2.

According to the above configuration, the hierarchical layer processingunit 3041 outputs data of at most three lines (hierarchical layer A,hierarchical layer B, hierarchical layer C), and for each hierarchicallayer one of the ISDB-T scheme, MISO, and MIMO can be selected.

In the transmitter 3000 illustrated in FIG. 57, the hierarchical layercombining unit 5051, the time interleaving unit 5061, and the frequencyinterleaving unit 5071 of each transmit antenna perform the sameoperations as in the transmitter 5000, which is conventional andillustrated in FIG. 75. In other words, operations are the same withrespect to both transmit antennas. However, as described later usingFIG. 60 (a portion of definitions of the TMCC signal), in the frequencyinterleaving unit 5071 illustrated in FIG. 77, the segment division unit5301 allocates MISO/MIMO coherent modulation portions to a coherentmodulation portion or a differential modulation portion (whichever isnot already used) when the ISDB-T scheme is not already using thecoherent modulation portion or the differential modulation portion. Inthis way, frequency interleaving is independently performed with respectto the ISDB-T scheme and the MISO/MIMO scheme, and the ISDB-T scheme andthe MISO/MIMO scheme are not mixed within each segment after frequencyinterleaving. However, a hierarchical layer of MISO and a hierarchicallayer of MIMO may be mixed within each segment after frequencyinterleaving.

The pilot signal generation unit 3081 generates pilot signals forsynchronization and recovery. With respect to segments belonging tohierarchical layers of MIMO or MISO, pilot signals for synchronizationand recovery for MIMO/MISO are generated. The TMCC/AC signal generationunit 3091 generates a TMCC signal that is control information and an ACsignal that is auxiliary information. With respect to segments belongingto hierarchical layers of MIMO and MISO, a TMCC signal for MIMO and aTMCC signal for MISO are generated.

As an example of a coherent modulation portion of mode 1 illustrated inFIG. 59, a segment configuration of MIMO and MISO is described. As shownin FIG. 59, when OFDM symbol numbers are even, SP signals of bothtransmit antennas have the same phase, and when OFDM symbol numbers areodd, SP signals of Tx-2 have an opposite phase to SP signals of Tx-1.Further, by placing a continual pilot (CP) signal of the ISDB-T scheme(Tx-1: CP, Tx-2: null) at carrier number 0, when a coherent modulationportion segment of the ISDB-T scheme is adjacent to a lower frequency,the CP functions instead of SPs of the coherent modulation portion ofthe ISDB-T scheme. However, when the segment adjacent to a lowerfrequency is a segment of MIMO or MISO, the CP signal is transmittedfrom both transmit antennas. In such a case, when OFDM symbol numbersare even, CP signals of both transmit antennas have the same phase, andwhen OFDM symbol numbers are odd, CP signals of Tx-2 have an oppositephase to CP signals of Tx-1.

Further, MIMO/MISO coding is not performed with respect to the TMCCsignal and the AC signal, and the same signal is transmitted from bothtransmit antennas (Tx-1, Tx-2). Further, by making the frequencydirection placement the same as in the ISDB-T scheme, existing ISDB-Treceivers can also receive the TMCC signal and the AC signal ofMIMO/MISO segments.

FIG. 60 illustrates a portion of definitions of the TMCC signal. Portion(a) and portion (b) of FIG. 60 each illustrate a carrier modulationmapping scheme of the ISDB-T scheme and embodiment 9, respectively. Asshown in portion (b) of FIG. 60, in embodiment 9, “100” and “101” thatare undefined in the ISDB-T scheme are allocated to MISO and MIMO,respectively. In this way, segments of MISO or MIMO can be recognized as“unreceivable” by existing ISDB-T receivers, and receivers that supportMISO and MIMO can recognize segments of MISO or MIMO.

Portions (c) and (d) of FIG. 60 illustrate definitions of B110-B121 inthe ISDB-T scheme and embodiment 9. As shown in portion (d) of FIG. 60,in embodiment 9, “000”, “001”, and “010” of B110-B112 that are undefinedin the ISDB-T scheme are allocated to QPSK (MISO/MIMO), 16-QAM(MISO/MIMO), and 64-QAM (MISO/MIMO), respectively. In this way, withoutadversely affecting existing ISDB-T receivers, a receiver supportingMISO and MIMO can recognize a carrier modulation mapping scheme ofsegments of MISO or MIMO.

Portions (e) and (f) of FIG. 60 illustrate definitions of segmentidentification in the ISDB-T scheme and embodiment 9. As shown inportion (f) of FIG. 60, in embodiment 9, “000” identifies a coherentmodulation portion or a MISO/MIMO coherent modulation portion, and “001”identifies a differential modulation portion or a MISO/MIMO coherentmodulation portion. In the ISDB-T scheme, when a coherent modulationportion or a differential modulation portion is unused, the “000” or“111” can be defined as a MISO/MIMO coherent modulation portion. Whetheror not “000” and “111” are MISO/MIMO coherent modulation portions can berecognized according to the definition of carrier modulation mappingscheme illustrated in portion (b) of FIG. 60. An existing ISDB-Treceiver interprets “000” and “111” as a coherent modulation portion anda differential modulation portion, respectively, but when the definitionof carrier modulation mapping scheme illustrated in portion (b) of FIG.60 is “100” and “101” (a segment of MISO and MIMO, respectively), whichare undefined in the ISDB-T scheme, “000” and “111” can be recognized as“unreceivable”. In contrast, a receiver supporting MISO and MIMO,according to the definition of carrier modulation mapping schemeillustrated in portion (b) of FIG. 60, recognizes segments of MISO orMIMO, and can recognize a MISO/MIMO coherent modulation portion. In thisway, without adversely affecting existing ISDB-T receivers, a receiversupporting MISO and MIMO can recognize a carrier modulation mappingscheme of segments of MISO or MIMO.

The frame building unit 3101 builds a transmission frame frominformation data outputted from the frequency interleaving units 5071corresponding to each transmit antenna, the pilot signals forsynchronization and recovery outputted from the pilot signal generationunit 3081, and the TMCC signal and AC signal outputted from the TMCC/ACsignal generation unit 3091. Here, points of difference from the framebuilding unit 5101, which is conventional and illustrated in FIG. 75,are that a transmission frame is built for each of the two transmitantennas (Tx-1, Tx-2), and segments of MIMO or MISO may be included.

In the transmitter 3000 illustrated in FIG. 57, the OFDM signalgeneration units 5111, the D/A conversion units 5121, and the frequencyconversion units 5131 perform the same operations as in the transmitter5000, which is conventional and illustrated in FIG. 75. In other words,operations are the same with respect to both transmit antennas.

According to the above configuration, in polarization MIMO, the existingISDB-T scheme and a new scheme using polarization MIMO can co-exist, anda transmitter, transmission method, and program are provided that makeintroduction of the new scheme easy. Further, in the new scheme usingpolarization MIMO, sufficient exhibition of polarization diversityeffect is achieved, and a particular feature is implementation using aprocessing method having high compatibility with the existing ISDB-Tscheme (the same time interleaving, frequency interleaving, etc., as inthe ISDB-T scheme).

<Existing ISDB-T Receiver and Reception Method>

FIG. 61 illustrates a configuration of an existing ISDB-T receiver 3300.The ISDB-T receiver 3300 illustrated in FIG. 61 corresponds to thetransmitter 5000, illustrated in FIG. 75, and reflects functions of thetransmitter 5000.

The ISDB-T receiver 3300 includes a tuner unit 3305, an A/D conversionunit 3308, a demodulation unit 3311, a frequency de-interleaving unit3315, a time de-interleaving unit 3321, a multiple hierarchical layer TSreproduction unit 3331, an FEC decoding unit 3333, and a TMCC signaldecoding unit 3335.

The following describes operations of the ISDB-T receiver 3300. Withrespect to a signal transmitted from the transmitter 5000 illustrated inFIG. 75, upon input of an analog RF transmission signal from a receiveantenna Rx-1, the tuner unit 3305 selectively receives a signal of aselected frequency channel (CH-Y), and down-converts the signal to apredefined band. The A/D conversion unit 3308 performs analogue todigital conversion, and outputs a digital reception signal. Thedemodulation unit 3311 performs OFDM demodulation, outputs mapping data(cells) of I/Q coordinates after equalization and a transmission channelestimate value to the frequency de-interleaving unit 3315 and outputsFFT output before equalization to the TMCC signal decoding unit 3335.

The TMCC signal decoding unit 3335, with respect to the FFT outputbefore equalization outputted from the demodulation unit 3311, performsdifferential BPSK demodulation with respect to each carrier with respectto which the TMCC signal illustrated in FIG. 59 is placed, and decodesthe TMCC signal by performing majority decoding of demodulation resultsaccumulated for each segment. The decoded TMCC signal is outputted tothe demodulation unit 3311, the frequency de-interleaving unit 3315, thetime de-interleaving unit 3321, the multiple hierarchical layer TSreproduction unit 3331, and the FEC decoding unit 3333, and operationsare performed in each unit based on the decoded TMCC signal.

The frequency de-interleaving unit 3315, with respect to the mappingdata of I/Q coordinates after equalization and the transmission channelestimate value outputted from the demodulation unit 3311, performsfrequency de-interleaving with respect to each of a partial receptionportion, a differential modulation portion, and a coherent modulationportion. The time de-interleaving unit 3321, with respect to output fromthe frequency de-interleaving unit 3315, performs time de-interleaving.

FIG. 62 illustrates a configuration of the multiple hierarchical layerTS reproduction unit 3331. The multiple hierarchical layer TSreproduction unit 3331 includes a single-input single-output (SISO)de-mapping unit 3401, a bit de-interleaving unit 3411, a de-punctureunit 3421, and a TS reproduction unit 3431. The SISO de-mapping unit3401 performs de-mapping processing based on mapping data of I/Qcoordinates after equalization and the transmission channel estimatevalue that have undergone de-interleaving by the frequencyde-interleaving unit 3315 and the time de-interleaving unit 3321. Thebit de-interleaving unit 3411 performs bit de-interleaving, and thede-puncture unit 3421 performs de-puncture processing. The TSreproduction unit 3431 performs TS reproduction of each hierarchicallayer with respect to output of the de-puncture unit 3421.

FIG. 63 illustrates a configuration of the FEC decoding unit 3333. TheFEC decoding unit 3333 includes a Viterbi decoding unit 3441, a bytede-interleaving unit 3451, an energy dispersal inversion unit 3461, andan RS decoding unit 3471. With respect to output from the multiplehierarchical layer TS reproduction unit 3331, the Viterbi decoding unit3441 performs Viterbi decoding, the byte de-interleaving unit 3451performs byte de-interleaving, the energy dispersal inversion unit 3461performs energy dispersal inversion, and the RS decoding unit 3471performs RS decoding.

According to the above operations, the ISDB-T receiver 3300 illustratedin FIG. 61, with respect to a signal transmitted from the transmitter5000 illustrated in FIG. 75, outputs a TS of each hierarchical layerthat has undergone error correction decoding. Note that the componentsof the ISDB-T receiver 3300 illustrated in FIG. 61, aside from the tunerunit 3305, may be included in an integrated circuit 3341.

Next, only points of difference are described regarding operations ofthe ISDB-T receiver 3300 with respect to a signal transmitted from thetransmitter 3000 illustrated in FIG. 57 and the previously describedoperations of the ISDB-T receiver 3300 with respect to a signaltransmitted from the transmitter 5000 illustrated in FIG. 75.

With respect to a signal transmitted from the transmitter 3000illustrated in FIG. 57, upon input of an analog RF transmission signalfrom the receive antenna Rx-1, the tuner unit 3305 and the A/Dconversion unit 3308 perform the same operations as describedpreviously.

The TMCC signal decoding unit 3335, the same as previously described,performs decoding of a TMCC signal by performing majority decoding withrespect to demodulation results accumulated for each segment. Note thatin a segment to which a hierarchical layer of MISO or MIMO is allocated,the transmitter 3000 illustrated in FIG. 57, with respect to a TMCCsignal, transmits the same signal from both transmit antennas (Tx-1,Tx-2) without performing MIMO/MISO coding. Accordingly, the TMCC signaldecoding unit 3335 can decode a TMCC signal of a segment to which ahierarchical layer of MISO or MIMO is allocated, and according to theTMCC signal definition illustrated in FIG. 60, determine such segmentsas being unreceivable.

Such a determination result is outputted to the demodulation unit 3311,the frequency de-interleaving unit 3315, the time de-interleaving unit3321, the multiple hierarchical layer TS reproduction unit 3331, and theFEC decoding unit 3333, and each unit performs processing of only asegment to which a hierarchical layer of the ISDB-T scheme is allocated.

According to the above operations, the ISDB-T receiver 3300 illustratedin FIG. 61, with respect to a signal transmitted from the transmitter3000 illustrated in FIG. 57, outputs a TS of a hierarchical layer of theISDB-T scheme that has undergone error correction decoding.

<Receiver and Reception Method>

FIG. 64 illustrates a configuration of a receiver 3500 in embodiment 9.The receiver 3500 illustrated in FIG. 64 corresponds to the transmitter3000, illustrated in FIG. 57, and reflects functions of the transmitter3000. Components that are the same as in the existing ISDB-T receiverhave the same reference signs, and description thereof is omitted here.

The receiver 3500, compared to the ISDB-T receiver 3300 illustrated inFIG. 61, is configured such that the multiple hierarchical layer TSreproduction unit 3331 and the TMCC signal decoding unit 3335 arereplaced by a multiple hierarchical layer TS reproduction unit 3531 anda TMCC signal decoding unit 3535. Further, the demodulation unit 3311 isreplaced by demodulation units 3511 that each correspond to a respectivetransmit antenna. Further, in the receiver 3500, the tuner unit 3305,the A/D conversion unit 3308, the frequency de-interleaving unit 3315,and the time de-interleaving unit 3321 are each provided in a plurality,and each unit corresponds to a respective transmit antenna.

The following describes operations of the receiver 3500. With respect toa signal transmitted from the transmitter 3000 illustrated in FIG. 57,when an analog RF transmission signal is inputted from both receiveantennas (Rx-1, Rx-2), the tuner unit 3305 of each receive antenna andthe A/D conversion unit 3308 of each receive antenna perform the sameoperations as those of the ISDB-T receiver 3300 illustrated in FIG. 61.

The demodulation unit 3511 of each receive antenna performs OFDMdemodulation. However, with respect to a segment to which a hierarchicallayer of MISO or MIMO is allocated, without performing equalization,transmission channel estimation for MISO/MIMO is performed based on theSP signals illustrated in FIG. 59. Accordingly, the demodulation unit3511 of each receive antenna, with respect to a segment to which ahierarchical layer of MISO or MIMO is allocated, outputs FFT outputbefore equalization to the frequency de-interleaving units 3315 and theTMCC signal decoding unit 3535, and outputs a transmission channelestimate value to the frequency de-interleaving units 3315.

The TMCC signal decoding unit 3535, with respect to the FFT outputbefore equalization outputted from the demodulation units 3511, performsdecoding of the TMCC signal by performing differential BPSK demodulationand majority decoding in the same way as the TMCC signal decoding unit3335 illustrated in FIG. 61. However, by performing majority decodingusing output from the demodulation unit 3511 of both receive antennas(Rx-1, Rx-2), decoding performance is further increased. Further, theTMCC signal decoding unit 3535 recognises the definitions of TMCC signalillustrated in FIG. 60, and even with respect to a segment to which ahierarchical layer of MISO or MIMO is allocated, detects whether or notMISO or MIMO is specified, and detects the carrier modulation mappingscheme (QPSK, 16-QAM, 64-QAM).

Such detection results are outputted to the demodulation unit 3511 ofeach receive antenna, the frequency de-interleaving unit 3315 of eachreceive antenna, the time de-interleaving unit 3321 of each receiveantenna, the multiple hierarchical layer TS reproduction unit 3531, andthe FEC decoding unit 3333, and each unit performs processing of asegment to which a hierarchical layer of the ISDB-T scheme is allocatedand a segment to which a hierarchical layer of MISO or MIMO isallocated.

Operations of the frequency de-interleaving unit 3315 of each receiveantenna and the time de-interleaving unit 3321 of each antenna are thesame as the operations described with reference to FIG. 61. However, thefrequency de-interleaving unit 3315, as indicated in portion (f) of FIG.60, performs frequency de-interleaving using frequency de-interleavingfunctions corresponding each receive antenna of an ISDB-T coherentmodulation portion or an ISDB-T differential modulation portion to whicha MISO/MIMO coherent modulation portion is allocated. Further, withrespect to a segment to which a hierarchical layer of the ISDB-T schemeis allocated, operation of the frequency de-interleaving unit 3315 andthe time de-interleaving unit 3321 of one receive antenna (Rx-1 or Rx-2)can be suspended. Alternatively operations of the frequencyde-interleaving unit 3315 and the time de-interleaving unit 3321 of bothreceive antennas (Rx-1, Rx-2) can be performed, further increasingreception performance by execution of diversity reception.

FIG. 65 illustrates a configuration of the multiple hierarchical layerTS reproduction unit 3531. The multiple hierarchical layer TSreproduction unit 3531, compared to the multiple hierarchical layer TSreproduction unit 3331 illustrated in FIG. 62, is configured such thatthe SISO de-mapping unit 3401 is replaced by a SISO/MISO/MIMO de-mappingunit 3501. The SISO/MISO/MIMO de-mapping unit 3501, based on an inputtedTMCC signal, performs the same operations as the SISO de-mapping unit3401 with respect to a segment to which a hierarchical layer of theISDB-T scheme is allocated, and performs MISO or MIMO de-mappingprocessing with respect to a segment to which a hierarchical layer ofMISO or MIMO is allocated. Other operations of the multiple hierarchicallayer TS reproduction unit 3531 illustrated in FIG. 65 are the same asoperations of the multiple hierarchical layer TS reproduction unit 3331illustrated in FIG. 62.

The FEC decoding unit 3333 illustrated in FIG. 64 performs the sameoperations as the FEC decoding unit 3333 illustrated in FIG. 61.

In the following, MIMO de-mapping processing performed by theSISO/MISO/MIMO de-mapping unit 3501 is described. An input vectory=(y1_k, y2_k)^(T) to the SISO/MISO/MIMO de-mapping unit 3501 isexpressed as shown in Formula 39.[Math 39]y=Hz+n  (Formula 39)

yP_k is input data with respect to a receive antenna P. H is atransmission channel matrix expressed in Formula 40. n=(n1 k, n2 k)^(T)is a noise vector. nP_k is an i.i.d. complex Gaussian noise of varianceσ² that has an average value 0.

$\begin{matrix}\lbrack {{Math}\mspace{14mu} 40} \rbrack & \; \\{H = \begin{pmatrix}{h11\_ k} & {h\; 12{\_ k}} \\{h\; 21{\_ k}} & {h\; 22{\_ k}}\end{pmatrix}} & ( {{Formula}\mspace{14mu} 40} )\end{matrix}$

Using Formula 39 and Formula 40, the SISO/MISO/MIMO de-mapping unit 3501performs maximum-likelihood decoding (MLD), calculates a vectorestimated value s′=(s′2 k+1, s′2 k+2)^(T), and outputs the vectorestimated value s′. Note that processing of the SISO/MISO/MIMOde-mapping unit 3501 is not limited to MLD, and other methods such aszero forcing (ZF) may be used.

According to the above configuration, in polarization MIMO, a receiver,reception method, and program are provided that receive a signaltransmitted by dispersing mapping data to each polarization antenna.

Further, the components of the receiver 3500 illustrated in FIG. 64,aside from the tuner unit 3305, may be included in an integrated circuit3541.

Embodiment 10

<Transmitter and Transmission Method>

FIG. 66 illustrates a configuration of a transmitter 3600 in embodiment10. Components that are the same as in the conventional transmitter orthe transmitter in embodiment 9 have the same reference signs, anddescription thereof is omitted here.

The transmitter 3600 illustrated in FIG. 66, compared to the transmitter3000 in embodiment 9 illustrated in FIG. 57, is configured such that theTS re-multiplexing unit 5011, the hierarchical layer division unit 5031,and the TMCC/AC signal generation unit 3091 are replaced by a TSre-multiplexing unit 3611, a hierarchical layer division unit 3631, anda TMCC/AC signal generation unit 3691, respectively. Further, an LDPChierarchical layer allocation unit 3635 and an LDPC hierarchical layerprocessing unit 3645 are added. In embodiment 10, LDPC coding is onlyperformed with respect to hierarchical layer C. However, the presentinvention is not limited in this way, and LDPC coding may be performedwith respect to another hierarchical layer, or may be performed withrespect to a plurality of hierarchical layers.

The following describes operations of the transmitter 3600. The TSre-multiplexing unit 3611 receives as input two out of three TSsoutputted from an MPEG-2 multiplexing unit (not illustrated), andconverts the two TSs into a single TS. With respect to vacant time dueto the remaining TS not being inputted, the TS re-multiplexing unit 3611inserts a null packet. The hierarchical layer division unit 3631performs hierarchical layer division of at most two lines (hierarchicallayer A, hierarchical layer B) according to a specification made inhierarchical information.

On the other hand, the LDPC hierarchical layer allocation unit 3635inputs the remaining one TS, allocates the one TS to hierarchical layerC, which is to be LDPC coded, generates timing information of each TSpacket, and outputs the timing information, along with each TS packet,to the LDPC hierarchical layer processing unit 3645.

FIG. 67 illustrates a configuration of the LDPC hierarchical layerprocessing unit 3645. The LDPC hierarchical layer processing unit 3645,compared to the hierarchical layer processing unit 3041 in embodiment 10illustrated in FIG. 58, is configured such that the byte interleavingunit 5211 and the convolutional coding unit 5221 are not included, and aBCH coding unit 3711 and an LDPC coding unit 3721 are added. Further,the LDPC hierarchical layer processing unit 3645 is configured such thatthe bit interleaving unit 5231 is replaced by a bit interleaving unit3731.

In the LDPC hierarchical layer processing unit 3645, the BCH coding unit3711 accumulates data included in one or more TS packets outputted fromthe LDPC hierarchical layer allocation unit 3635, stores timinginformation in a header as information bits, and performs BCH coding.The energy dispersal unit 5201 performs the same operations describedwith reference to FIG. 76. The LDPC coding unit 3721 performs LDPCcoding, and in order to draw out LDPC coding capabilities the bitinterleaving unit 3731 typically performs bit interleaving that isdifferent from the bit interleaving of the bit interleaving unit 5231 ofthe ISDB-T scheme, which is illustrated in FIG. 58. Operations from themapping unit 5241 onwards are the same as the operations of thehierarchical layer processing unit 3041 illustrated in FIG. 58.

In the transmitter 3600 illustrated in FIG. 66, the hierarchical layercombining units 5051, with respect to output data from the hierarchicallayer processing units 3041-A, 3041-B, and the LDPC hierarchical layerprocessing unit 3645-C, perform the same operations as the hierarchicalcombining units 5051 illustrated in FIG. 57.

The TMCC/AC signal generation unit 3691 generates a TMCC signal that iscontrol information and an AC signal that is auxiliary information. Withrespect to segments belonging to hierarchical layers of MIMO and MISO, aTMCC signal for MIMO and a TMCC signal for MISO are generated, and withrespect to segments belonging to an LDPC hierarchical layer, a TMCCsignal related to LDPC coding is generated.

FIG. 68 illustrates definitions of TMCC signals with respect to LDPCcoding. Portion (a) and portion (b) of FIG. 68 each illustrateconvolutional coding rates of the ISDB-T scheme and embodiment 10,respectively. As illustrated in portion (b) of FIG. 68, in embodiment10, LDPC coding is allocated to “101”, which is undefined in the ISDB-Tscheme. In this way, an LDPC coded segment can be recognized as“unreceivable” by an existing ISDB-T receiver, and can be recognized asan LDPC coded segment by a receiver that supports LDPC coding.

Portion (c) of FIG. 68 illustrates definitions of B110-B121 inembodiment 10. As illustrated in portion (c) of FIG. 60, in embodiment10, ½ (LDPC coding rate), ⅔ (LDPC coding rate), ¾ (LDPC coding rate), ⅚(LDPC coding rate), and ⅞ (LDPC coding rate) are respectively allocatedto “000”-“100” of B113-B115, which are undefined in the ISDB-T scheme.In this way, without adversely affecting existing ISDB-T receivers, areceiver supporting LDPC coding can recognize LDPC coding rates.

Other operations of the transmitter 3600 are the same as those of thetransmitter 3000 in embodiment 9, illustrated in FIG. 57.

According to the above configuration, in polarization MIMO, the existingISDB-T scheme and a new scheme using polarization MIMO can co-exist, anda transmitter, transmission method, and program are provided that makeintroduction of the new scheme easy. Further, by using BCH coding andLDPC coding as error correction coding schemes in the new scheme, errorcorrection performance is increased. Further, in the new scheme usingpolarization MIMO, sufficient exhibition of polarization diversityeffect is achieved, and a particular feature is implementation using aprocessing method having high compatibility with the existing ISDB-Tscheme (the same time interleaving, frequency interleaving, etc., as inthe ISDB-T scheme).

<Existing ISDB-T Receiver and Reception Method>

Here, only points of difference are described regarding operations ofthe ISDB-T receiver 3300 illustrated in FIG. 61 with respect to a signaltransmitted from the transmitter 3600 illustrated in FIG. 66 andoperations of the ISDB-T receiver 3300 previously described with respectto a signal transmitted from the transmitter 3000 in embodiment 9,illustrated in FIG. 57.

The TMCC signal decoding unit 3335, the same as the operations describedin embodiment 9, performs decoding of a TMCC signal by performingmajority decoding with respect to demodulation results accumulated foreach segment. Accordingly, the TMCC signal decoding unit 3335 can alsodecode a TMCC signal of an LDPC coded segment, and according to the TMCCsignal definition illustrated in FIG. 68, determine such segments asbeing unreceivable.

Such a determination result is outputted to the demodulation unit 3311,the frequency de-interleaving unit 3315, the time de-interleaving unit3321, the multiple hierarchical layer TS reproduction unit 3331, and theFEC decoding unit 3333. Each unit performs processing of only a segmentto which a hierarchical layer of the ISDB-T scheme is allocated.

According to the above operations, the ISDB-T receiver 3300 illustratedin FIG. 61, with respect to a signal transmitted from the transmitter3600 illustrated in FIG. 66, outputs a TS of a hierarchical layer of theISDB-T scheme that has undergone error correction decoding.

<Receiver and Reception Method>

FIG. 69 illustrates a configuration of a receiver 3800 in embodiment 10.The receiver 3800 illustrated in FIG. 69 corresponds to the transmitter3600, illustrated in FIG. 66, and reflects functions of the transmitter3600. Components that are the same as in the existing ISDB-T receiver orthe receiver in embodiment 9 have the same reference signs, anddescription thereof is omitted here.

The receiver 3800, compared to the receiver 3500 in embodiment 9illustrated in FIG. 64, is configured such that the multiplehierarchical layer TS reproduction unit 3531, the FEC decoding unit3333, and the TMCC signal decoding unit 3535 are replaced by a multiplehierarchical layer TS reproduction unit 3831, an FEC decoding unit 3833,and a TMCC signal decoding unit 3835, respectively.

The following describes operations of the receiver 3800. The TMCC signaldecoding unit 3835 recognizes definitions of TMCC signals illustrated inFIG. 68, and even with respect to LDPC coded segments, detects LDPCcoding and also detects LDPC coding rate.

In a TMCC signal, a detection result related to LDPC coding inparticular is outputted to the multiple hierarchical layer TSreproduction unit 3831 and the FEC decoding unit 3833.

FIG. 70 illustrates a configuration of the multiple hierarchical layerTS reproduction unit 3831. The multiple hierarchical layer TSreproduction unit 3831, compared to the multiple hierarchical layer TSreproduction unit 3531 illustrated in FIG. 65, is configured such thatthe SISO/MISO/MIMO de-mapping unit 3501 is replaced by a SISO/MISO/MIMOde-mapping unit 3801. The SISO/MISO/MIMO de-mapping unit 3801, based onan inputted TMCC signal, with respect to data of an LDPC coded segment,outputs data after de-mapping processing as LDPC hierarchical layerdata. With respect to data that is not LDPC coded, in the same way asthe operations described with reference to FIG. 62, the SISO/MISO/MIMOde-mapping unit 3801 outputs data after de-mapping processing to the bitde-interleaving unit 3411, and operations from the bit de-interleavingunit 3411 onwards are the same as those described with reference to FIG.62, outputting non-LDPC hierarchical layer data.

FIG. 71 illustrates a configuration of the FEC decoding unit 3833. TheFEC decoding unit 3833, compared to the FEC decoding unit 3333illustrated in FIG. 63, is configured such that a bit de-interleavingunit 3911, an LDPC decoding unit 3941, a BCH decoding unit 3971, and anLDPC hierarchical layer/non-LDPC hierarchical layer combining unit 3981are added, and one more energy dispersal inversion unit 3461 is added.

The FEC decoding unit 3833 illustrated in FIG. 71, with respect tonon-LDPC hierarchical layer data, performs the same operations describedwith reference to FIG. 63 from the Viterbi decoding unit 3441 to the RSdecoding unit 3471. Further, with respect to LDPC hierarchical layerdata, the FEC decoding unit 3833 performs bit de-interleaving at the bitde-interleaving unit 3911, LDPC decoding at the LDPC decoding unit 3941,energy dispersal inversion at the energy dispersal inversion unit 3461,and BCH decoding at the BCH decoding unit 3971.

The LDPC hierarchical layer/non-LDPC hierarchical layer combining unit3981, based on timing information included in a header of LDPChierarchical layer decoded data outputted from the BCH decoding unit3971, combines decoded data of both hierarchical layers by inserting theLDPC hierarchical layer decoded data in non-LDPC hierarchical layerdecoded data outputted from the RS decoding unit 3471, and therebyoutputs a TS that has undergone error correction decoding.

According to the above configuration, in polarization MIMO, a receiver,reception method, and program are provided that receive a signaltransmitted by dispersing mapping data to each polarization antenna. Inparticular, cases using BCH coding and LDPC coding as error correctioncoding schemes in a new scheme are also supported.

Further, the components of the receiver 3800 illustrated in FIG. 69,aside from the tuner unit 3305, may be included in an integrated circuit3841.

Embodiment 11

<Transmitter and Transmission Method>

FIG. 72 illustrates a configuration of a transmitter 4000 in embodiment11. Components that are the same as in the conventional transmitter orthe transmitter in embodiment 9 have the same reference signs, anddescription thereof is omitted here. In embodiment 11, at a transportstream (TS) generation unit, a video base layer (video B) and a videoenhancement layer (video E) are generated as video components usingscalable video coding (SVC). In this way, audio, video B, and video Eare allocated to hierarchical layers component by component, and, foreach hierarchical layer, an existing ISDB-T scheme, MISO, and MIMO maybe selected.

The transmitter 4000 illustrated in FIG. 72, compared to the transmitter3000 in embodiment 9 illustrated in FIG. 57, is configured such that theTS re-multiplexing unit 5011 is replaced by a TS re-multiplexing unit4011. Further, the transmitter 4000 illustrated in FIG. 72 is configuredsuch that a hierarchical layer allocation unit 4005 is added.

FIG. 73 illustrates a configuration of a TS generation unit 4210. The TSgeneration unit 4210 illustrated in FIG. 73 shows an example in which asingle program is generated in a TS, and has one each of an audio codingunit 4221 and a video coding unit 4222. Further, the TS generation unit4210 has packetization units 4223 on a one-for-one basis for the servicecomponents (audio, video B, and video E) in programs. Further, the TSgeneration unit 4210 has a packetized stream multiplexing unit 4224 andan L2 information processing unit 4225.

In the TS generation unit 4210, the audio coding unit 4221 performsinformation source coding of audio. The video coding unit 4222 performsinformation source coding of video using SVC, and generates the twocomponents, video B and video E. H.264, HEVC (H.265), etc., are examplesof information source coding.

Each packetization unit 4223 packetizes output of the audio coding unit4221 or the video coding unit 4222. The L2 information processing unit4225 generates L2 information such as program-specific information(PSI), system information (SI), etc. The packetized stream multiplexingunit 4224 generates a TS by multiplexing output of the packetizationunit 4223 and output of the L2 information processing unit 4225, andoutputs the TS to the transmitter 4000 illustrated in FIG. 72.

In the transmitter 4000 illustrated in FIG. 72, the hierarchical layerallocation unit 4005 allocates to hierarchical layers the servicecomponents (audio, video B, and video E) included in a program and L2information of a TS outputted from the TS generation unit 4210. In FIG.72, as one example, the hierarchical layer allocation unit 4005allocates as follows:

Hierarchical layer A: audio, video B, and L2 information of program-1

Hierarchical layer B: video E of program-1

In the example illustrated in FIG. 72, the packets of audio, video B,and L2 information are actually multiplexed into a single input to theTS re-multiplexing unit 4011. Operations of the TS re-multiplexing unit4011 are the same as the operations described with respect to FIG. 57,with the exception that a stream composed of multiplexed audio, video B,and L2 information packets and a stream composed of video E packets areeach treated as a single TS.

The hierarchical layer division unit 5031 performs hierarchical layerdivision according to the allocation made by the hierarchical layerallocation unit 4005.

In the transmitter 4000 illustrated in FIG. 72, The hierarchical layerprocessing unit 3041-A operates as in the existing ISDB-T scheme, andthe hierarchical layer processing unit 3041-B operates as for MISO orMIMO.

Other operations of the transmitter 4000 illustrated in FIG. 72 are thesame as those of the transmitter 3000 in embodiment 9 illustrated inFIG. 57.

According to the above configuration, audio, video B, and video E areallocated to hierarchical layers component by component, and, for eachhierarchical layer, an existing ISDB-T scheme, MISO, and MIMO may beselected. In particular, with respect to audio and video B, by selectingthe existing ISDB-T scheme, the existing ISDB-T receiver can receivehierarchical layers of basic information, and basic information portionsof a program, for example the program in standard definition, canthereby be enjoyed.

<Existing ISDB-T Receiver and Reception Method>

Here, only points of difference are described regarding operations ofthe ISDB-T receiver 3300 illustrated in FIG. 61 with respect to a signaltransmitted from the transmitter 4000 illustrated in FIG. 72 andoperations of the ISDB-T receiver 3300 previously described with respectto a signal transmitted from the transmitter 3000 in embodiment 9,illustrated in FIG. 57.

The TMCC signal decoding unit 3335, the same as in the operationsdescribed in embodiment 9, decodes the TMCC signal by performingmajority decoding of demodulation results accumulated for each segment,and determines that a segment to which hierarchical layer B (video E ofprogram-1) of MISO or MIMO is allocated is unreceivable.

Such a determination result is outputted to the demodulation unit 3311,the frequency de-interleaving unit 3315, the time de-interleaving unit3321, the multiple hierarchical layer TS reproduction unit 3331, and theFEC decoding unit 3333, and each unit performs processing of only asegment to which hierarchical layer A (audio, video B, and L2information of program-1) of the ISDB-T scheme is allocated.

According to the above operations, the ISDB-T receiver 3300 illustratedin FIG. 61, with respect to a signal transmitted from the transmitter4000 illustrated in FIG. 72, outputs a TS of a hierarchical layer of theISDB-T scheme that has undergone error correction decoding. In otherwords, the ISDB-T receiver 3300 outputs the audio, video B, and L2information of program-1.

<Receiver and Reception Method>

Here, only points of difference are described regarding operations ofthe receiver 3500 illustrated in FIG. 64 with respect to a signaltransmitted from the transmitter 4000 illustrated in FIG. 72 andoperations of the receiver 3500 previously described with respect to asignal transmitted from the transmitter 3000 in embodiment 9,illustrated in FIG. 57.

The TMCC signal decoding unit 3535, the same as in the operationsdescribed in embodiment 9, with respect to a segment to which ahierarchical layer B (video E of program-1) of MISO or MIMO isallocated, detects whether or not MISO or MIMO is specified and detectsthe carrier modulation mapping scheme (QPSK, 16-QAM, 64-QAM).

Such detection results are outputted to the demodulation unit 3511 ofeach receive antenna, the frequency de-interleaving unit 3315 of eachreceive antenna, the time de-interleaving unit 3321 of each receiveantenna, the multiple hierarchical layer TS reproduction unit 3531, andthe FEC decoding unit 3333, and each unit performs processing of asegment to which a hierarchical layer A (audio, video B, and L2information of program-1) of the ISDB-T scheme is allocated and asegment to which a hierarchical layer B (video E of program-1) of MISOor MIMO is allocated.

According to the above operations, the receiver 3500 illustrated in FIG.64, with respect to a signal transmitted from the transmitter 4000illustrated in FIG. 72, outputs a TS of a hierarchical layer A of theISDB-T scheme that has undergone error correction decoding and ahierarchical layer B of MISO or MIMO that has undergone error correctiondecoding. In other words, the receiver 3500 outputs all components(audio, video B, video E, and L2 information) of program-1.

Embodiment 12

<Transmitter and Transmission Method>

FIG. 74 illustrates a configuration of a transmitter 4300 in embodiment12. Components that are the same as in the conventional transmitter orthe transmitter in embodiments 9-11 have the same reference signs, anddescription thereof is omitted here. In embodiment 11, in a TSgeneration unit, SVC is used to generate both video B and video E asvideo components. In this way, audio, video B, and video E are allocatedto hierarchical layers component by component, and, for eachhierarchical layer, an existing ISDB-T scheme, MISO, and MIMO may beselected. Further, BCH coding and LDPC coding are used as errorcorrection coding in MISO and MIMO, which are new schemes.

The transmitter 4300 illustrated in FIG. 74, compared to the transmitter3600 in embodiment 10 illustrated in FIG. 66, is configured such thatthe TS re-multiplexing unit 3611 is replaced by a TS re-multiplexingunit 4311. Further, the transmitter 4300 illustrated in FIG. 74 isconfigured such that a hierarchical layer allocation unit 4005 is added.

In the transmitter 4300 illustrated in FIG. 74, the hierarchical layerallocation unit 4005, in the same way as in embodiment 11, allocates tohierarchical layers the service components (audio, video B, and video E)included in a program and L2 information of a TS outputted from the TSgeneration unit 4210. In FIG. 74, as one example, the hierarchical layerallocation unit 4005 allocates as follows:

Hierarchical layer A: audio, video B, and L2 information of program-1

Hierarchical layer C: video E of program-1

In the example illustrated in FIG. 74, the packets of audio, video B,and L2 information are actually multiplexed into a single input to theTS re-multiplexing unit 4311. Operations of the TS re-multiplexing unit4311 are the same as operations described with respect to FIG. 66,except the TS re-multiplexing unit 4311 treats a stream composed ofmultiplexed audio, video B, and L2 information packets as a single TS,and inserts a null packet with respect to vacant time due to theremaining component (video E) not being inputted.

The hierarchical layer division unit 3631 performs hierarchical layerdivision of a stream composed of multiplexed audio, video B, and L2information packets to a hierarchical layer A, as allocated by thehierarchical layer allocation unit 4005.

The LDPC hierarchical layer allocation unit 3635, as allocated by thehierarchical layer allocation unit 4005, inputs the stream composed ofthe remaining one component (video E), allocates the TS to hierarchicallayer C, which is to be LDPC coded, generates timing information of eachTS packet, and outputs the timing information, along with each TSpacket, to the LDPC hierarchical layer processing unit 3645.

In the transmitter 4300 illustrated in FIG. 74, the hierarchical layerprocessing unit 3041-A operates as in the existing ISDB-T scheme, andthe LDPC hierarchical layer processing unit 3645-C operates as for MISOor MIMO.

Other operations of the transmitter 4300 illustrated in FIG. 74 are thesame as those of the transmitter 3600 in embodiment 10, illustrated inFIG. 66.

According to the above configuration, audio, video B, and video E areallocated to hierarchical layers component by component, and, for eachhierarchical layer, an existing ISDB-T scheme, MISO, and MIMO may beselected. Further, BCH coding and LDPC coding are used as errorcorrection coding in MISO and MIMO, which are new schemes. Inparticular, with respect to audio and video B, by selecting the existingISDB-T scheme, the existing ISDB-T receiver can receive hierarchicallayers of basic information, and basic information portions of aprogram, for example the program in standard definition, can thereby beenjoyed.

<Existing ISDB-T Receiver and Reception Method>

Here, only points of difference are described regarding operations ofthe ISDB-T receiver 3300 illustrated in FIG. 61 with respect to a signaltransmitted from the transmitter 4300 illustrated in FIG. 74 andoperations of the ISDB-T receiver 3300 previously described with respectto a signal transmitted from the transmitter 3000 in embodiment 9,illustrated in FIG. 57.

The TMCC signal decoding unit 3335, the same as in the operationsdescribed in embodiment 9, decodes the TMCC signal by performingmajority decoding of demodulation results accumulated for each segment,and determines that a segment to which hierarchical layer C (video E ofprogram-1) of MISO or MIMO is allocated is unreceivable.

Such a determination result is outputted to the demodulation unit 3311,the frequency de-interleaving unit 3315, the time de-interleaving unit3321, the multiple hierarchical layer TS reproduction unit 3331, and theFEC decoding unit 3333, and each unit performs processing of only asegment to which a hierarchical layer A (audio, video B, L2 information)of the ISDB-T scheme is allocated.

According to the above operations, the ISDB-T receiver 3300 illustratedin FIG. 61, with respect to a signal transmitted from the transmitter4300 illustrated in FIG. 74, outputs a TS of a hierarchical layer of theISDB-T scheme that has undergone error correction decoding. In otherwords, the ISDB-T receiver 3300 outputs the audio, video B, and L2information of program-1.

<Receiver and Reception Method>

Here, only points of difference are described regarding operations ofthe receiver 3800 illustrated in FIG. 69 with respect to a signaltransmitted from the transmitter 4300 illustrated in FIG. 74 andoperations of the receiver 3800 previously described with respect to asignal transmitted from the transmitter 3000 in embodiment 9,illustrated in FIG. 57.

The TMCC signal decoding unit 3835, the same as in the operationsdescribed in embodiment 10, but even with respect to a segment to whichLDPC is performed, and to which a hierarchical layer C (video E ofprogram-1) of MISO or MIMO is allocated, detects whether or not MISO orMIMO is specified, detects the carrier modulation mapping scheme (QPSK,16-QAM, 64-QAM), and also detects LDPC coding and LDPC coding rate.

Such a detection result is outputted to the demodulation unit 3511 ofeach receive antenna, the frequency de-interleaving unit 3315 of eachreceive antenna, the time de-interleaving unit 3321 of each receiveantenna, the multiple hierarchical layer TS reproduction unit 3831, andthe FEC decoding unit 3833. Each unit performs processing of a segmentto which a hierarchical layer A (audio, video B, L2 information ofprogram-1) of the ISDB-T scheme is allocated and a segment to which LDPCis performed and to which a hierarchical layer C (video E of program-1)of MISO or MIMO is allocated.

According to the above operations, the receiver 3800 illustrated in FIG.69, with respect to a signal transmitted from the transmitter 4300illustrated in FIG. 74, outputs a TS of a hierarchical layer of theISDB-T scheme that has undergone error correction decoding and of ahierarchical layer of MISO or MIMO that has undergone LDPC coding. Inother words, the receiver 3800 outputs all components (audio, video B,video E, and L2 information) of program-1.

(Supplement)

The present invention is not limited to the content described inembodiments 9-12. Any form of implementation is possible in order toachieve aims of the present invention and related or associated aims.For example, the following implementations are possible.

(1) In embodiment 9-12, a TMCC signal and an AC signal are transmittedas the same signal from both transmit antennas (Tx-1, Tx-2) withoutperforming MIMO/MISO coding thereon. However, the present invention isnot limited in this way, and a TMCC signal and an AC signal may betransmitted from one transmit antenna without performing MIMO/MISOcoding thereon.

(2) In embodiments 9-12, the ISDB-T scheme, MIMO, and MISO can be madeto coexist. However, the present invention is not limited in this way,and two of the above may be made to coexist, or only MIMO or MISO may betransmittable and receivable.

(3) In embodiments 9-12, the ISDB-T scheme may be preferentiallyallocated to a middle segment (data segment number 0) of a frequencyband. In particular, a partial-reception portion of the ISDB-T schememay be preferentially allocated to the middle segment.

(4) In embodiments 9-12, the number of transmit antennas used for MISOand/or MIMO is illustrated as two. However, the present invention is notlimited in this way, and there may be three or more transmit antennasused for MISO and/or MIMO. Further, the number of transmit antennas andreceive antennas may differ from each other.

(5) In embodiments 9-12, a different polarization is applied withrespect to the two transmit antennas (Tx-1, Tx-2) for MISO and/or MIMO,but the same polarization may be used.

(6) In embodiment 11-12, hierarchical layer A is transmitted by theISDB-T scheme and hierarchical layers B and C are transmitted by MISO orMIMO. However, the present invention is not limited in this way and, forexample, hierarchical layer A may be transmitted by MISO, andhierarchical layer B or C may be transmitted by MIMO.

(7) In embodiments 9-12, phase change is applied with respect to thetransmit antenna 2 (Tx-2). However, the present invention is not limitedin this way, and phase change may be applied with respect to thetransmit antenna 1 (Tx-1).

(8) In embodiments 9-12, coherent modulation is applied with respect toMISO and/or MIMO, but differential modulation may be applied.

(9) In embodiments 11-12, the number of TSs is one, but the presentinvention is not limited in this way. Further, the number of programs inthe TS is given as one, but the present invention is not limited in thisway.

(10) In embodiments 11-12, the service components are described as audioand video, but the present invention is not limited in this way. Datacomponents, etc., may be included. Further, in embodiments 11-12, aconfiguration that performs scalable coding with respect to video isdescribed. However, the present invention is not limited in this way,and scalable coding may be performed with respect to audio, datacomponents, etc.

(11) In embodiments 11-12, description is given of video B and video Ebeing generated by SVC. However, the present invention is not limited inthis way. For example, a base view (MVC_B) and a dependent view (MVC_D)may be generated by multi-view video coding (MVC). In such a case, ifMVC_B is allocated to a hierarchical layer corresponding to the existingISDB-T scheme, and MVC_D is allocated to a different hierarchical layercorresponding to MISO or MIMO, an existing ISDB-T receiver could receivea hierarchical layer of basic information, and basic informationportions of a program, for example the program in 2D, can thereby beenjoyed. Further, a receiver that supports MISO and/or MIMO couldreceive hierarchical layers of basic information and extendedinformation such that, for example, a program can thereby be enjoyed in3D.

(12) In embodiments 11-12, audio, video B, and L2 information correspondto the existing ISDB-T scheme and video E corresponds to MISO or MIMO,but the present invention is not limited in this way. For example, audioand L2 information may correspond to the existing ISDB-T scheme, video Bmay correspond to MISO, and video E may correspond to MIMO.

(13) In embodiments 9-12, the time interleaving unit 5061 and thefrequency interleaving unit 5071 perform the same operations as in thetransmitter 5000, which is conventional and illustrated in FIG. 75.Further, in embodiments 9-12, a segment to which a hierarchical layer ofMISO or MIMO is allocated has the segment structure of MIMO and MISOillustrated in FIG. 59. To match a number of data carriers of one symbolin a segment of MIMO and MISO with the number of data carriers of onesymbol in the ISDB-T scheme, the number of AC carriers may be reduced,for example. Alternatively, when the number of data carriers differsfrom the ISDB-T scheme, the time interleaving unit 5061 and thefrequency interleaving unit 5071 may operate using null carriers to makeup the difference in the number of data carriers, and delete the nullcarriers when outputting. While the present invention is not limited tosuch a method, the time interleaving unit 5061 and the frequencyinterleaving unit 5071 can thereby maintain a high compatibility with aISDB-T scheme. Further, with respect to the segment configuration ofMIMO and MISO illustrated in FIG. 59, carrier direction density of pilotsignals for synchronization and recovery for MIMO/MISO may, for example,be doubled. Even in such a case, the time interleaving unit 5061 and thefrequency interleaving unit 5071 can maintain a high compatibility witha ISDB-T scheme.

(14) The above-described embodiments 9-12 may be implemented by usingsoftware and hardware. The above-described embodiments may beimplemented or executed by using a computing device (processor). Thecomputing device or processor may be, for example, a mainprocessor/general purpose processor, a digital signal processor (DSP),an application-specific integrated circuit (ASIC), a field programmablegate array (FPGA), other programmable logic devices, etc. Theabove-described embodiments may be executed or implemented by acombination of such devices.

(15) Embodiments 9-12 may be implemented by an arrangement of softwaremodules that are executed by a processor or directly executed byhardware. Further, a combination of a software module and hardware ispossible. A software module may be stored on any of a variety ofcomputer-readable storage media, for example, RAM, EPROM, EEPROM, flashmemory, a register, hard disk, CD-ROM, DVD, etc.

SUMMARY

The following is a summary of the transmission device, transmissionmethod, reception device, and reception method pertaining to embodimentsof the present invention, and the effects thereof.

A transmission device (1) is a transmitter that performs multiple-inputmultiple-output (MIMO) transmission of transmit data using a pluralityof fundamental bands, comprising: an error correction coding unit that,for each data block of predefined length, performs error correctioncoding and thereby generates an error correction coded frame; a mappingunit that maps each predefined number of bits in the error correctioncoded frame to a corresponding symbol and thereby generates an errorcorrection coded block; and a MIMO coding unit that performs MIMO codingwith respect to the error correction coded block, wherein components ofdata included in the error correction coded block are allocated to atleast two of the fundamental bands and transmitted.

According to the transmission device (1), with respect to MIMO using aplurality of fundamental bands, a transmitter is provided that exhibitsa frequency diversity effect related to the fundamental bands, due tothe components of data included in the error correction coded blockbeing allocated to at least two of the fundamental bands andtransmitted.

A transmission device (2) is the transmission device (1), wherein basicinformation of the transmit data is transmitted by MIMO, using aplurality of fundamental bands, extended information of the transmitdata is transmitted using a single fundamental band, the basicinformation is independently decodable, and the extended information isdecodable when combined with the basic information.

According to the transmission device (2), a transmitter is provided thatcan select, for each PLP, MIMO using a plurality of fundamental bands orMIMO using a single fundamental band, due to transmission of the basicinformation of transmit data by MIMO using a plurality of fundamentalbands and transmission of the extended information of transmit datausing a single fundamental band.

A transmission device (3) is the transmission device (1), wherein thenumber of transmit antennas used for MIMO is two, and each of thetransmit antennas has a different polarity.

According to the transmission device (3), with respect to MIMO using aplurality of fundamental bands, a transmitter is provided that exhibitsa polarity diversity effect in addition to a frequency diversity effectrelated to the fundamental bands, due to the number of transmit antennasused for MIMO being two, and each of the transmit antennas having adifferent polarity.

A transmission device (4) is the transmission device (1), whereincomponents of data included in the error correction coded block areallocated to at least two antennas from among a plurality of antennasused for the MIMO transmission.

According to the transmission device (4), with respect to MIMO using aplurality of fundamental bands, a transmitter is provided that exhibitsa spatial (antenna) diversity effect in addition to a frequencydiversity effect related to the fundamental bands, due to the componentsof data included in the error correction coded block being allocated toat least two antennas from among the plurality of antennas used for MIMOtransmission.

A transmission device (5) is the transmission device (1) or thetransmission device (4), wherein the number of the fundamental bands isequal to K, where K is a natural number greater than 1, and the numberof transmit antennas is equal to M, where M is a natural number greaterthan 1, the MIMO coding unit has K×M output ports, each output portcorresponding to a respective one of the fundamental bands and arespective one of the transmit antennas, and the components of dataincluded in the error correction coded block are outputted to all of theK×M output ports.

According to the transmission device (5), with respect to MIMO using aplurality of fundamental bands, a transmitter is provided that exhibitsa frequency diversity effect related to the fundamental bands, due tothe MIMO coding unit outputting the components of data included in theerror correction coded block to the output ports that correspond to allthe fundamental bands and all the antennas.

A transmission device (6) is the transmission device (5), wherein theMIMO coding unit performs MIMO coding using a pre-coding matrix havingK×M rows and K×M columns.

According to the transmission device (6), with respect to MIMO using aplurality of fundamental bands, a transmitter is provided that exhibitsa frequency diversity effect related to the fundamental bands, due tothe MIMO coding unit using the pre-coding matrix to output thecomponents of data included in the error correction coded block to theoutput ports that correspond to all the fundamental bands and all theantennas.

A transmission device (7) is the transmission device (1) or thetransmission device (4), further comprising: a serial to parallel (S/P)conversion unit, wherein the number of the fundamental bands is equal toK, where K is a natural number greater than 1, and the number oftransmit antennas is equal to M, where M is a natural number greaterthan 1, the S/P conversion unit has K output ports, each output portcorresponding to a respective one of the fundamental bands, the S/Pconversion unit allocates mapping data included in the error correctioncoded block to the K output ports, the MIMO coding unit is provided in aplurality such that each MIMO coding unit corresponds to a respectiveone of the fundamental bands, each of the MIMO coding units has M outputports, each output port corresponding to a respective one of thetransmit antennas, and the MIMO coding units perform MIMO coding withrespect to output data from the S/P conversion unit.

According to the transmission device (7), with respect to MIMO using aplurality of fundamental bands, a transmitter is provided that exhibitsa frequency diversity effect related to the fundamental bands, due tothe S/P conversion unit allocating mapping data included in the errorcorrection coded block to the output ports corresponding to all thefundamental bands.

A transmission device (8) is the transmission device (1) or thetransmission device (4), further comprising: a serial to parallel (S/P)conversion unit, wherein the number of the fundamental bands is equal toK, where K is a natural number greater than 1, and the number oftransmit antennas is equal to M, where M is a natural number greaterthan 1, the S/P conversion unit has K output ports, each output portcorresponding to a respective one of the fundamental bands, the S/Pconversion unit allocates data included in the error correction codedframe to the K output ports, the mapping unit and the MIMO coding unitare each provided in a plurality such that each mapping unit and eachMIMO coding unit corresponds to a respective one of the fundamentalbands, with respect to output data from the S/P conversion unit, each ofthe mapping units maps each predefined number of bits to a correspondingsymbol, each of the MIMO coding units has M output ports, each outputport corresponding to a respective one of the transmit antennas, and theMIMO coding units perform MIMO coding with respect to output data fromthe mapping units.

According to the transmission device (8), with respect to MIMO using aplurality of fundamental bands, a transmitter is provided that exhibitsa frequency diversity effect related to the fundamental bands, due tothe S/P conversion unit allocating data included in the error correctioncoded frame to the output ports corresponding to all the fundamentalbands.

A transmission device (9) is the transmission device (7) or thetransmission device (8), wherein each one of the MIMO coding unitsperforms MIMO coding using a pre-coding matrix, each pre-coding matrixhaving M rows and M columns.

According to the transmission device (9), with respect to MIMO using aplurality of fundamental bands, a transmitter is provided that exhibitsa frequency diversity effect related to the fundamental bands, due tothe S/P conversion unit allocating mapping data included in the errorcorrection coded block or data included in the error correction codedframe to the output ports corresponding to all the fundamental bands,and due to the MIMO coding unit performing MIMO coding using thepre-coding matrix.

A transmission device (10) is the transmission device (1) or thetransmission device (4), further comprising: a serial to parallel (S/P)conversion unit and a fundamental band interchange unit, wherein thenumber of the fundamental bands is equal to K, where K is a naturalnumber greater than 1, and the number of transmit antennas is equal toM, where M is a natural number greater than 1, the S/P conversion unithas K output ports, each output port corresponding to a respective oneof the fundamental bands, the S/P conversion unit allocates each of thedata blocks of predefined length to one of the K fundamental bands, theerror correction coding unit, the mapping unit, and the MIMO coding unitare each provided in a plurality such that each error correction codingunit, each mapping unit, and each MIMO coding unit corresponds to arespective one of the fundamental bands, each of the error correctioncoding units performs error correction coding on output data from theS/P conversion unit and thereby generates an error correction codedframe, and the fundamental band interchange unit, with respect to outputdata from one of the error correction coding units, the mapping units,and the MIMO coding units, interchanges each predefined unit length ofthe output data among the fundamental bands.

According to the transmission device (10), with respect to MIMO using aplurality of fundamental bands, a transmitter is provided that exhibitsa frequency diversity effect related to the fundamental bands, due tothe S/P conversion unit allocating each data block of a predefinedlength to the output ports corresponding to all of the fundamentalbands, and interchange of each predefined unit length of output datafrom one of the error correction coding units, the mapping units, andthe MIMO coding units among the fundamental bands.

A transmission device (11) is the transmission device (1) or thetransmission device (4), further comprising: a serial to parallel (S/P)conversion unit; interleaving units; and a fundamental band interchangeunit, wherein the number of the fundamental bands is equal to K, where Kis a natural number greater than 1, and the number of transmit antennasis equal to M, where M is a natural number greater than 1, the S/Pconversion unit has K output ports, each output port corresponding to arespective one of the fundamental bands, the S/P conversion unitallocates each of the data blocks of predefined length to one of the Kfundamental bands, the error correction coding unit, the mapping unit,and the MIMO coding unit are each provided in a plurality such that eacherror correction coding unit, each mapping unit, and each MIMO codingunit corresponds to a respective one of the fundamental bands, each ofthe error correction coding units performs error correction coding onoutput data from the S/P conversion unit and thereby generates an errorcorrection coded frame, each of the MIMO coding units has M outputports, and M corresponding interleaving units perform interleaving withrespect to data outputted therefrom, and the fundamental bandinterchange unit, with respect to output data from one of the errorcorrection coding units, the mapping units, and the interleaving units,interchanges each predefined unit length of the output data among thefundamental bands.

According to the transmission device (11), with respect to MIMO using aplurality of fundamental bands, a transmitter is provided that exhibitsa frequency diversity effect related to the fundamental bands, due tothe S/P conversion unit allocating each data block of a predefinedlength to the output ports corresponding to all of the fundamentalbands, the interleaving units that correspond to the fundamental bandsperforming interleaving with respect to output data of the MIMO codingunits, and interchange of each predefined unit length of output datafrom one of the error correction coding units, the mapping units, theMIMO coding units, and the interleaving units among the fundamentalbands.

A transmission device (12) is the transmission device (10) or thetransmission device (11), wherein each one of the MIMO coding unitsperforms MIMO coding using a pre-coding matrix having M rows and Mcolumns.

According to the transmission device (12), with respect to MIMO using aplurality of fundamental bands, a transmitter is provided that exhibitsa frequency diversity effect related to the fundamental bands, due tothe S/P conversion unit allocating each data block of a predefinedlength to the output ports corresponding to all of the fundamentalbands, interchange of each predefined unit length of data of afundamental band among the fundamental bands, and the MIMO coding unitsperforming MIMO coding using the pre-coding matrix.

A transmission device (13) is the transmission device (1) or thetransmission device (4), wherein the MIMO coding unit has a phase changeunit that regularly changes a signal phase transmitted from at least oneof the transmit antennas for each of the fundamental bands.

According to the transmission device (13), with respect to MIMO using aplurality of fundamental bands, a transmitter is provided that exhibitsa reception quality improvement effect for data in a line of sight (LOS)environment in which direct waves are dominant in addition to afrequency diversity effect related to the fundamental bands, due to theMIMO coding unit regularly changing a signal phase transmitted from atleast one of the antennas for each of the fundamental bands and due tothe components of data included in the error correction coded blockbeing allocated to at least two of the fundamental bands andtransmitted.

A transmission device (14) is any one of the transmission device (7),the transmission device (8), or the transmission device (10), wherein atleast one of the following is performed: in the MIMO coding units,different MIMO coding for each of the fundamental bands; in the MIMOcoding units, MIMO coding using a different pre-coding matrix for eachof the fundamental bands, the pre-coding matrices each having M rows andM columns; in the MIMO coding units, a signal phase is regularly changedfor each of the fundamental bands; in the mapping units, mapping of adifferent pattern for each of the fundamental bands; and in the errorcorrection coding units, error correction coding of a different patternfor each of the fundamental bands.

According to the transmission device (14), with respect to MIMO using aplurality of fundamental bands, a transmitter is provided that exhibitsa reception quality improvement effect in addition to a frequencydiversity effect related to the fundamental bands, due to correlationreduction related to transmission channel characteristics of thefundamental bands.

A transmission device (15) is the transmission device (11), wherein atleast one of the following is performed: in the interleaving units,interleaving of a different pattern for each of the fundamental bands;in the MIMO coding units, different MIMO coding for each of thefundamental bands; in the MIMO coding units, MIMO coding using adifferent pre-coding matrix for each of the fundamental bands, thepre-coding matrices each having M rows and M columns; in the MIMO codingunits, a signal phase is regularly changed for each of the fundamentalbands, a signal phase pattern being different for each of thefundamental bands; in the mapping units, mapping of a different patternfor each of the fundamental bands; and in the error correction codingunits, error correction coding of a different pattern for each of thefundamental bands.

According to the transmission device (15), with respect to MIMO using aplurality of fundamental bands, a transmitter is provided that exhibitsa reception quality improvement effect in addition to a frequencydiversity effect related to the fundamental bands, due to correlationreduction related to transmission channel characteristics of thefundamental bands.

A transmission device (16) is the transmission device (11), wherein theinterleaving units perform interleaving of a different pattern for eachof the fundamental bands, and M interleaving units corresponding to onefundamental band perform interleaving of the same pattern.

According to the transmission device (16), a transmitter is providedthat, without increasing an amount of computation for MIMO de-mappingand in addition to a frequency diversity effect related to fundamentalbands, exhibits a reception quality improvement effect due tocorrelation reduction related to transmission channel characteristics ofthe fundamental bands, due to the interleaving units performinginterleaving of a different pattern for each of the fundamental bandsand performing interleaving of the same pattern for each of the transmitantennas within a fundamental band.

A reception device (17) is a receiver that receives a signal transmittedby multiple-input multiple-output (MIMO) using a plurality offundamental bands, components of data included in an error correctioncoded block in the signal being allocated to at least two of thefundamental bands, the receiver comprising: a demodulation unit for eachof the fundamental bands, the demodulation unit performing demodulating;a MIMO de-mapping unit that performs MIMO de-mapping with respect todemodulated data; and an error correction decoding unit that performserror correction decoding with respect to output of the MIMO de-mappingunit.

According to the reception device (17) or a reception method (19) thatis described below, a receiver (reception method) is provided such thata signal transmitted via MIMO using a plurality of fundamental bands isreceived, due to (i) the demodulation units (demodulation step) whereindemodulation for each of the fundamental bands is performed, (ii) theMIMO de-mapping units (MIMO de-mapping step) wherein MIMO de-mapping isperformed with respect to data that is demodulated, and (iii) the errorcorrection decoding unit (error correction decoding step) wherein errorcorrection coding is performed with respect to the output of the MIMOde-mapping.

A transmission method (18) is a transmission method of performingmultiple-input multiple-output (MIMO) transmission using a plurality offundamental bands, comprising: performing error correction coding foreach data block of predefined length, thereby generating an errorcorrection coded frame; mapping each predefined number of bits in theerror correction coded frame to a corresponding symbol and therebygenerating an error correction coded block; and performing MIMO codingwith respect to the error correction coded block, wherein components ofdata included in the error correction coded block are allocated to atleast two of the fundamental bands and transmitted.

According to the transmission method (18), with respect to MIMO using aplurality of fundamental bands, a transmission method is provided thatexhibits a frequency diversity effect related to the fundamental bands,due to the components of data included in the error correction codedblock being allocated to at least two of the fundamental bands andtransmitted.

A reception method (19) is a reception method of receiving a signaltransmitted by multiple-input multiple-output (MIMO) using a pluralityof fundamental bands, components of data included in an error correctioncoded block in the signal being allocated to at least two of thefundamental bands, the reception method comprising: performingdemodulation of data for each of the fundamental bands; performing MIMOde-mapping with respect to demodulated data; and performing errorcorrection decoding with respect to output of the MIMO de-mapping.

A transmission device (20) is a transmitter that has a function ofexecuting communication via multiple-input multiple-output (MIMO),comprising: an error correction coding unit that performs errorcorrection coding with respect to transmit data; a mapping unit thatmaps each predefined number of bits in data that is error correctioncoded to a corresponding modulated symbol, the mapping unit therebygenerating mapping data; a MIMO coding unit that performs MIMO codingwith respect to the mapping data; a control information generation unitthat generates control information that includes a transmissionparameter; a frame building unit that builds a transmission frame byincluding, within the same orthogonal frequency division multiplexing(OFDM) symbol, MIMO coded data outputted from the MIMO coding unit andthe control information; and an OFDM signal generation unit that appliesan OFDM scheme with respect to the transmission frame, wherein MIMOcoding is not performed with respect to the control information, and thecontrol information is transmitted as the same content from multipletransmit antennas or the control information is transmitted from onetransmit antenna.

According to the transmission device (20), a transmitter is providedthat allows introduction of a new scheme using MIMO without adverselyaffecting receivers of a SISO scheme, due to building a transmissionframe by including, within the same OFDM symbol, MIMO coded data andcontrol information that includes a transmission parameter, and, withoutperforming MIMO coding with respect to the control information,transmitting the control information as the same content from multipletransmit antennas or transmitting the control information from onetransmit antenna.

A transmission device (21) is the transmission device (20), wherein thenumber of transmit antennas used for MIMO is equal to M, where M is anatural number greater than 1, the MIMO coding unit has M output ports,each output port corresponding to a respective one of the transmitantennas, and the transmitter further comprises M interleaving units,each one of the interleaving units performing interleaving with respectto data outputted from respective one of the M output ports.

According to the transmission device (21), a transmitter is providedthat allows introduction of a new scheme using MIMO without adverselyaffecting receivers of a SISO scheme, due to each of the output ports ofthe MIMO coding unit corresponding to a respective one of the transmitantennas, and the transmitter further including an interleaving unit foreach of the output ports.

A transmission device (22) is the transmission device (21), wherein theM interleaving units perform interleaving of the same pattern.

According to the transmission device (22), a transmitter is providedthat allows introduction of a new scheme without adversely affectingreceivers of a SISO scheme and uses interleaving that has a highcompatibility with SISO schemes, due to each of the output ports of theMIMO coding unit corresponding to a respective one of the transmitantennas, and the transmitter further comprising the interleaving unitsthat perform interleaving of the same pattern with respect to data fromeach of the output ports.

A transmission device (23) is the transmission device (20), wherein thenumber of transmit antennas used for MIMO is two, and each of thetransmit antennas has a different polarity.

According to the transmission device (23), a transmitter is providedthat exhibits a polarity diversity effect in a new scheme using MIMO,due to the number of transmit antennas used for MIMO being two, and eachof the transmit antennas having a different polarity.

A transmission device (24) is the transmission device (20), wherein thecomponents of data included in the mapping data are allocated to andtransmitted from all the transmit antennas.

According to the transmission device (24), a transmitter is providedthat exhibits a spatial (antenna) diversity effect in a new scheme thatuses MIMO, due to each component of data included in mapping data beingallocated to and transmitted from all the transmit antennas.

A transmission device (25) is the transmission device (20) or thetransmission device (24), wherein the number of transmit antennas isequal to M, where M is a natural number greater than 1, the MIMO codingunit has M output ports, each output port corresponding to a respectiveone of the transmit antennas, and the components of data included in themapping data are outputted from all of the M output ports.

According to the transmission device (25), a transmitter is providedthat exhibits a spatial (antenna) diversity effect in a new scheme thatuses MIMO, due to the MIMO coding unit outputting each component of dataincluded in mapping data to the output ports corresponding to everyantenna.

A transmission device (26) is the transmission device (25), wherein theMIMO coding unit performs MIMO coding using a pre-coding matrix, thepre-coding matrix having M rows and M columns.

According to the transmission device (26), a transmitter is providedthat exhibits a spatial (antenna) diversity effect in a new scheme thatuses MIMO, due to the MIMO coding unit using the pre-coding matrix andoutputting each component of data included in mapping data to the outputports corresponding to every antenna.

A transmission device (27) is the transmission device (20) or thetransmission device (24), wherein the MIMO coding unit has a phasechange unit that regularly changes a signal phase transmitted from atleast one of the transmit antennas.

According to the transmission device (27), a transmitter is providedthat, in a new scheme using MIMO, exhibits a reception qualityimprovement effect for data in a line of sight (LOS) environment inwhich direct waves are dominant, in addition to a spatial (antenna)diversity effect, due to the MIMO coding unit regularly changing asignal phase transmitted from at least one antenna and due to componentsof data included in mapping data being allocated to every transmitantenna and transmitted.

A transmission device (28) is the transmission device (20), furthercomprising a hierarchical layer division unit and a segment divisionunit, wherein the hierarchical layer division unit divides the transmitdata into L hierarchical layers, where L is a natural number greaterthan 1, the MIMO coding unit is provided in a plurality such that eachMIMO coding unit corresponds to a respective one of the layers, thesegment division unit divides a transmission band into Q segments, whereQ is a natural number greater than 1, and allocates the MIMO coded datain each hierarchical layer to one of the segments, and the framebuilding unit builds a transmission frame by including, within the samesegment, data outputted from the segment division unit and the controlinformation.

According to the transmission device (28), a transmitter is providedthat allows introduction of a new scheme using MIMO without adverselyaffecting receivers of a SISO scheme that supports hierarchical layersand segmentation, due to division into hierarchical layers andsegmentation, and building of a transmission frame by including, withinthe same segment, MIMO coded data and control information.

A transmission device (29) is the transmission device (20), furthercomprising: a hierarchical layer division unit; multiple-inputmultiple-output/single-input single-output (MIMO/SISO) coding units; anda segment division unit, wherein the transmitter has a function ofexecuting communication via SISO, the hierarchical layer division unitdivides the transmit data into L hierarchical layers, where L is anatural number greater than 1, each of the MIMO/SISO coding unitscorresponds to a respective one of the hierarchical layers, and performsMIMO coding or SISO coding with respect to the mapping data, the segmentdivision unit divides a transmission band into Q segments, where Q is anatural number greater than 1, and allocates coded data in eachhierarchical layer to a different one of the segments, the coded databeing either MIMO coded data or SISO coded data, and the frame buildingunit builds a transmission frame by including, within the same segment,data outputted from the segment division unit and the controlinformation.

According to a transmission device (29), a transmitter is provided thatallows co-existence of a SISO scheme and a new scheme using MIMO, andeasy introduction of the new scheme, due to MIMO or SISO coding beingperformed for each hierarchical layer, the segment division unitallocating MIMO or SISO coded data of each hierarchical layer to adifferent segment, and the frame building unit building a transmissionframe by including, within the same segment, data outputted from thesegment division unit and the control information.

A transmission device (30) is the transmission device (29), wherein thehierarchical layer division unit divides basic information and extendedinformation of the transmit data into different ones of the hierarchicallayers, a MIMO/SISO coding unit of a hierarchical layer to which thebasic information is allocated performs SISO coding, a MIMO/SISO codingunit of a hierarchical layer to which the extended information isallocated performs MIMO coding, the basic information is independentlydecodable, and the extended information is decodable when combined withthe basic information.

According to the transmission device (30), a transmitter is providedthat allows reception of hierarchical layers of the basic information byreceivers that support a SISO scheme, and reception of hierarchicallayers of the basic information and the extended information byreceivers that support a new scheme using MIMO, due to SISO coding beingperformed with respect to hierarchical layers of the basic informationof transmit data, and MIMO coding being performed with respect tohierarchical layers of the extended information of transmit data.

A transmission device (31) is the transmission device (29), wherein thecontrol information generation unit generates, for each hierarchicallayer, control information that indicates MIMO or SISO.

According to the transmission device (31), a transmitter is providedthat allows a SISO scheme and a new scheme using MIMO to coexist, andeasy introduction of the new scheme, due to generation, for eachhierarchical layer, of the control information that indicates MIMO orSISO.

A transmission device (32) is the transmission device (29), furthercomprising: a pilot signal generation unit that generates pilots signalsby using a different pilot signal pattern for a segment to which MIMOcoded data is allocated and a segment to which SISO coded data isallocated.

According to the transmission device (32), a transmitter is providedthat allows a SISO scheme and a new scheme using MIMO to coexist, andeasy introduction of the new scheme, due to generation of a differentpilot signal pattern for a segment to which MIMO coded data is allocatedand a segment to which SISO coded data is allocated.

A transmission device (33) is the transmission device (32), wherein thepilot signal generation unit, with respect to the lowest frequencysub-carrier of segments to which MIMO coded data is allocated, deploys acontinual pilot (CP) signal to one transmit antenna, and deploys a nullsignal to all other transmit antennas.

According to the transmission device (33), a transmitter is providedthat allows a SISO scheme and a new scheme using MIMO to coexist, andeasy introduction of the new scheme, due to, with respect to the lowestfrequency sub-carrier of segments to which MIMO coded data is allocated,deploying of the CP signal to the one transmit antenna and deploying ofthe null signal to all the other transmit antennas.

A transmission device (34) is the transmission device (28) or thetransmission device (29), further comprising: a different correctioncoding hierarchical layer allocation unit that allocates at least oneportion of the transmit data to a hierarchical layer on which errorcorrection coding is to be performed that is different from errorcorrection coding to be performed on another hierarchical layer,generates timing information, and outputs the timing information withthe at least one portion of the transmit data, wherein the errorcorrection coding unit performs error correction coding by accumulatingoutput data from the different correction coding hierarchical layerallocation unit and storing the timing information in a header asinformation bits.

According to the transmission device (34), a transmitter is providedthat allows easy introduction of a new scheme using MIMO and/or MISOusing a different error correction coding method to SISO, due todivision into hierarchical layers and segmentation of transmit data, andthe different correction coding hierarchical layer allocation unitallocating the at least one portion of the transmit data to ahierarchical layer on which error correction coding is to be performedthat is different from error correction coding to be performed onanother hierarchical layer, generating timing information, andoutputting the timing information with the at least one portion of thetransmit data.

A transmission device (35) is the transmission device (28) or thetransmission device (29), wherein the frame building unit uses the samesub-carrier arrangement pattern of the control information for allsegments.

According to the transmission device (35), a transmitter is providedthat allows introduction of a new scheme using MIMO and/or MISO withoutadversely affecting receivers of a SISO scheme that supportshierarchical layers and segmentation, due to use of the same sub-carrierarrangement pattern of the control information for all the segments.

A reception device (36) is a receiver that has a function of executingcommunication via multiple-input multiple-output (MIMO), comprising: areception unit that receives a transmission frame in which MIMO codeddata and control information that includes transmission parameters areincluded within the same orthogonal frequency-division multiplexing(OFDM) symbol; a control information decoding unit that decodes thecontrol information and acquires the transmission parameters; and atransmitted data demodulation unit that demodulates the MIMO coded databased on the transmission parameters, wherein MIMO coding is notperformed with respect to the control information, and the controlinformation is transmitted as the same content from multiple transmitantennas or the control information is transmitted from one transmitantenna.

According to the reception device (36) or a reception method (38) thatis described below, a receiver (reception method) is provided such thata signal is received, the signal being transmitted via MIMO such thatMIMO coded data and control information that includes transmissionparameters are included within the same OFDM symbol, due to (i) thecontrol information decoding unit (control information decoding step)wherein the control information is decoded and transmission parametersare acquired, and (ii) the transmitted data demodulation unit(transmitted data demodulation step) wherein the MIMO coded data isdemodulated based on the transmission parameters.

A transmission method (37) is a transmission method of a transmitterthat has a function of executing communication via multiple-inputmultiple-output (MIMO), comprising: performing error correction codingwith respect to transmit data; mapping each predefined number of bits indata that is error correction coded to a corresponding modulated symbol,thereby generating mapping data; performing MIMO coding with respect tothe mapping data; generating control information that includes atransmission parameter; building a transmission frame by including,within the same orthogonal frequency division multiplexing (OFDM)symbol, MIMO coded data generated by the MIMO coding and the controlinformation; and generating an OFDM signal by applying OFDM with respectto the transmission frame, wherein MIMO coding is not performed withrespect to the control information, and the control information istransmitted as the same content from multiple transmit antennas or thecontrol information is transmitted from one transmit antenna.

According to the transmission method (37), a transmission method isprovided that allows introduction of a new scheme using MIMO withoutadversely affecting receivers of a SISO scheme, due to a transmissionframe being built by including, within the same OFDM symbol, MIMO codeddata and control information that includes a transmission parameter,and, without MIMO coding being performed with respect to the controlinformation, the control information being transmitted as the samecontent from multiple transmit antennas or the control information beingtransmitted from one transmit antenna.

A reception method (38) is a reception method of a receiver that has afunction of executing communication via multiple-input multiple-output(MIMO), comprising: receiving a transmission frame in which MIMO codeddata and control information are included within the same orthogonalfrequency-division multiplexing (OFDM) symbol; decoding the controlinformation and acquiring the transmission parameters; and demodulatingthe MIMO coded data based on the transmission parameters, wherein MIMOcoding is not performed with respect to the control information, and thecontrol information is transmitted as the same content from multipletransmit antennas or the control information is transmitted from onetransmit antenna.

INDUSTRIAL APPLICABILITY

The transmission device, transmission method, reception device,reception method, integrated circuit, and program pertaining to thepresent invention can be applied to MIMO.

REFERENCE SIGNS LIST

-   -   100, 150, 300, 500, 700, 900, 1100, 1300, 2000, 3000, 3600,        4000, 4300, 5000 transmitter    -   200, 250, 270, 400, 450, 600, 650, 800, 850, 1000, 1050, 1400,        1450, 3500, 3800 receiver    -   240, 241, 242, 440, 441, 640, 641, 840, 841, 1040, 1041, 1440,        1441, 3341, 3541, 3841 integrated circuit    -   131, 132, 331, 332, 333, 334, 531, 532, 731, 732, 931, 932,        1131, 1132, 2031 MIMO-PLP processing unit    -   141, 142, 341, 342, 343, 344, 541, 542, 941, 942, 1141, 1142,        1341, 2041 L1 information processing unit    -   151, 1351, 2051, 3101, 5101 frame building unit    -   161, 2061, 5111 OFDM signal generation unit    -   191, 2091, 5121 D/A conversion unit    -   196, 198, 2096, 5131 frequency conversion unit    -   2071 input processing unit    -   572, 582, 2072, 2082 FEC coding unit    -   233, 633, 3333, 3833 FEC decoding unit    -   373, 383, 2073, 2083, 5241 mapping unit    -   176, 177, 376, 377, 2076, 3261 MIMO coding unit    -   232, 235, 432, 434 MIMO de-mapping unit    -   174, 2074 interleaving unit    -   181, 1381, 2081 L1 information generation unit    -   205, 206, 3305 tuner unit    -   208, 209, 3308 A/D conversion unit    -   211, 212, 3311, 3511 demodulation unit    -   215 frequency de-interleaving/L1 information de-interleaving        unit    -   591, 991, 1191 frequency channel interchange unit    -   637, 1037 frequency channel inverse interchange unit    -   221, 222 PLP de-interleaving unit    -   231 selection unit    -   214, 378, 379, 581 S/P conversion unit    -   435, 635, 1435 P/S conversion unit    -   595, 1195, 3271 selector    -   1210, 4210 TS generation unit    -   1321 PLP allocation unit    -   1221, 4221 audio coding unit    -   1222, 4222 video coding unit    -   1223, 4223 packetization unit    -   1224, 4224 packetized stream multiplexing unit    -   1225, 4225 L2 information processing unit    -   3300 ISDB-T receiver    -   3611, 4011, 4311, 5011 TS re-multiplexing unit    -   5021 RS coding unit    -   3631, 5031 hierarchical layer division unit    -   3041, 5041 hierarchical layer processing unit    -   5051 hierarchical layer combining unit    -   5061 time interleaving unit    -   5071 frequency interleaving unit    -   3081, 5081 pilot signal generation unit    -   3091, 3691, 5091 TMCC/AC signal generation unit    -   5201 energy dispersal unit    -   5211 byte interleaving unit    -   5221 convolutional coding unit    -   3731, 5231 bit interleaving unit    -   3251 MISO coding unit    -   3315 frequency de-interleaving unit    -   3321 time de-interleaving unit    -   3331, 3531, 3831 multiple hierarchical layer TS reproduction        unit    -   3335, 3535 TMCC signal decoding unit    -   3401 SISO de-mapping unit    -   3411, 3911 bit de-interleaving unit    -   3421 de-puncture unit    -   3431 TS reproduction unit    -   3441 Viterbi decoding unit    -   3451 byte de-interleaving unit    -   3461 energy dispersal inversion unit    -   3471 RS decoding unit    -   3501, 3801 SISO/MISO/MIMO de-mapping unit    -   3635 LDPC hierarchical layer allocation unit    -   3645 LDPC hierarchical layer processing unit    -   3711 BCH coding unit    -   3721 LDPC coding unit    -   3941 LDPC decoding unit    -   3971 BCH decoding unit    -   3981 LDPC hierarchical layer/non-LDPC hierarchical layer        combining unit    -   4005 hierarchical layer allocation unit    -   5301 segment division unit    -   5311 inter-segment interleaving unit    -   5321 intra-segment carrier rotation unit    -   5331 intra-segment carrier randomizing unit

The invention claimed is:
 1. A reception device comprising: a receptioncircuit configured to receive a first exchanged cell stream and a secondexchanged cell stream in a first frequency band and a second frequencyband, respectively, the first exchanged cell stream and the secondexchanged cell stream having been generated and transmitted by atransmission device, the transmission device being configured to: splitbaseband frames into first frames and second frames; perform errorcorrection coding and mapping on the first frames to generate firstcells consisting of a first initial cell and first remaining cellsfollowing the first initial cell; perform error correction coding andmapping on the second frames to generate second cells consisting of asecond initial cell and second remaining cells following the secondinitial cell; and exchange a first subset of the first cells with asecond subset of the second cells to generate the first exchanged cellstream and the second exchanged cell stream, the first subset includingthe first initial cell and the second subset including the secondinitial cell; an inverse exchange circuit connected to the receptioncircuit and configured to exchange the first subset of the first cellswith the second subset of the second cells to generate a firstpre-exchange cell stream and a second pre-exchange cell stream; a firstprocessor connected to the inverse exchange circuit and configured toperform de-mapping on the first pre-exchange cell stream to generatefirst de-mapped data; a second processor connected to the inverseexchange circuit and configured to perform de-mapping on the secondpre-exchange cell stream to generate second de-mapped data; amultiplexing circuit connected to the first processor and the secondprocessor and configured to multiplex the first de-mapped data and thesecond de-mapped data to generate multiplexed data; and an errorcorrection decoding circuit connected to the multiplexing circuit andconfigured to perform error correction decoding on the multiplexed datato generate the baseband frames.
 2. The reception device according toclaim 1, wherein the reception circuit comprises a single antennathrough which the first exchanged cell stream and the second exchangedcell stream are to be received.
 3. A reception device comprising: areception circuit configured to receive a first exchanged cell streamand a second exchanged cell stream in a first frequency band and asecond frequency band, respectively, the first exchanged cell stream andthe second exchanged cell stream having been generated and transmittedby a transmission device, the transmission device being configured to:split baseband frames into first frames and second frames; perform errorcorrection coding and mapping on the first frames to generate firstcells consisting of N first exchanged cells and M first non-exchangedcells, N being an integer larger than 0 and equal to M; perform errorcorrection coding and mapping on the second frames to generate secondcells consisting of N second exchanged cells and M second non-exchangedcells; and exchange the N first exchanged cells with the N secondexchanged cells to generate the first exchanged cell stream and thesecond exchanged cell stream; an inverse exchange circuit connected tothe reception circuit and configured to exchange the N first exchangedcells with the N second exchanged cells to generate a first pre-exchangecell stream and a second pre-exchange cell stream; a first processorconnected to the inverse exchange circuit and configured to performde-mapping on the first pre-exchange cell stream to generate firstde-mapped data; a second processor connected to the inverse exchangecircuit and configured to perform de-mapping on the second pre-exchangecell stream to generate second de-mapped data; a multiplexing circuitconnected to the first processor and the second processor and configuredto multiplex the first de-mapped data and the second de-mapped data togenerate multiplexed data; and an error correction decoding circuitconnected to the multiplexing circuit and configured to perform errorcorrection decoding on the multiplexed data to generate the basebandframes.
 4. The reception device according to claim 3, wherein thereception circuit comprises a single antenna through which the firstexchanged cell stream and the second exchanged cell stream are to bereceived.
 5. A reception method comprising: receiving a first exchangedcell stream and a second exchanged cell stream in a first frequency bandand a second frequency band, respectively, the first exchanged cellstream and the second exchanged cell stream having been generated andtransmitted by a transmission device, the transmission device beingconfigured to: split baseband frames into first frames and secondframes; perform error correction coding and mapping on the first framesto generate first cells consisting of N first exchanged cells and Mfirst non-exchanged cells, N being an integer larger than 0 and equal toM; perform error correction coding and mapping on the second frames togenerate second cells consisting of N second exchanged cells and Msecond non-exchanged cells; and exchange the N first exchanged cellswith the N second exchanged cells to generate the first exchanged cellstream and the second exchanged cell stream; exchanging the N firstexchanged cells with the N second exchanged cells to generate a firstpre-exchange cell stream and a second pre-exchange cell stream;performing de-mapping on the first pre-exchange cell stream to generatefirst de-mapped data; performing de-mapping on the second pre-exchangecell stream to generate second de-mapped data; multiplexing the firstde-mapped data and the second de-mapped data to generate multiplexeddata; and performing error correction decoding on the multiplexed datato generate the baseband frames.
 6. The reception method according toclaim 5, wherein the first exchanged cell stream and the secondexchanged cell stream are received through a single antenna.